A chemist determined that moles of silver participated in a chemical reaction using measurements. The mass of silver involved in the chemical reaction is 1.08 grams.
Moles of silver participated = 0.01
Molar mass of silver = 108 gram/mole
Weight of silver participated= mole* molar mass
= 0.01*108 gram
= 1.08 gram
A chemist (from the Greek chm(a) alchemy; replacing chymist from Medieval Latin alchemist) is a scientist who studies chemistry. Chemists investigate the structure and properties of matter. Chemists meticulously describe the properties of molecules and their constituent atoms in terms of quantities. Chemists carefully measure the proportions of substances, the rates of chemical reactions, and other chemical properties. Pharmacists are commonly referred to as chemists in Commonwealth English.
Chemists apply their knowledge to learn the composition and properties of new substances, as well as to reproduce and synthesize large quantities of useful naturally occurring substances and to create new artificial substances and processes.
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After the shuttle disaster, an unknown compound residue was removed from a piece of the debris. Upon analysis, it was found to contain 2. 61 g of carbon, 6. 09 g of nitrogen, and 1. 31 g of hydrogen. What is its empirical formula?
The empirical formula of the compound is C2N3H2.
What is an Empirical formula?
An empirical formula is a type of chemical formula that shows the simplest ratio of atoms in a molecule, rather than the total number of atoms. It is the simplest possible chemical formula that shows the relative numbers of each type of atom in a molecule.
This formula is determined by dividing the mass of each element by its atomic weight, and then dividing the result by the lowest of the results. The lowest result is 0.817 g/mol for carbon. This means that 2.61 g of carbon is equivalent to 3.17 moles of carbon. Thus, the ratio of elements in the compound is 3.17 moles of carbon, 7.44 moles of nitrogen, and 1.6 moles of hydrogen. Dividing each of these numbers by the lowest number (3.17) gives the ratio of 2 for carbon, 2.35 for nitrogen, and 0.5 for hydrogen. This ratio is simplified to 2:2:1, which corresponds to the empirical formula C2N3H2.
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What element has 4 protons 6 neutrons and 4 electrons
Answer:
Beryllium is the element that is atomic number 4 on the periodic table.
Ex: Mg + 2HCl—-> MgCl₂ + H₂ If 4.48L of H₂ gas at STP is
produced in 40 sec, what is the reaction rate in mol/sec?
Answer:
The reaction rate in mol/sec is 0.005.
Explanation:
To determine the reaction rate in mol/sec, you need to first determine the number of moles of H₂ gas produced in the reaction. The volume of a gas at STP (standard temperature and pressure) is directly proportional to the number of moles of the gas, so you can use the volume of H₂ gas produced to calculate the number of moles.
At STP, 1 mole of a gas occupies a volume of 22.4 L. Therefore, the number of moles of H₂ gas produced in the reaction can be calculated as follows:
moles H₂ = 4.48 L / 22.4 L/mol = 0.2 mol
To determine the reaction rate in mol/sec, you need to divide the number of moles of H₂ gas produced by the time it took for the reaction to occur:
reaction rate (mol/sec) = 0.2 mol / 40 sec = 0.005 mol/sec
So, the reaction rate in mol/sec is 0.005.
Explain what it means for materials to move down their concentration gradient and up their concentration gradient.
Moving down the concentration gradient means that materials move from an area of high concentration of the material to an area of low concentration of the material.
What is concentration?In chemistry, concentration is the amount of a substance in a given space. Another way to describe concentration is the proportion of the solute to a solvent or entire solution. In general, mass/unit volume is used to express concentration. Instead of using volume, concentration can be stated as a mass per unit. Although concentration is typically used to describe chemical solutions, it may be computed for any mixture.
This can be seen in osmosis, where water moves from a higher concentration of solute to a lower concentration of solute.
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The amount of atomic particles released by a radioactive material in a specific time is determined by strong and weak nuclear forces. strong and weak gravitational forces. attraction and repulsion caused by electric forces. attraction and repulsion caused by magnetic forces.
The amount of atomic particles released by a radioactive material in a specific time is determined by strong and weak nuclear forces option- 1 is correct.
What exactly do you mean by radioactive materials?Radioactive materials fall under the category of radionuclides, which are chemicals with unstable atomic nuclei. They adjust the nucleus to stabilize themselves (spontaneous fission, emission of alpha particles, or conversion of neutrons to protons or the reverse).
The amount of atomic particles released by a radioactive material over a given period of time depends on how quickly it decays.
The weak nuclear forces that exist between the nucleons of atomic particles control how quickly radioactive materials decay over time.
The nuclear forces can therefore be used to calculate the total number of atomic particles that a radioactive material releases in a given period of time (strong or weak).
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List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3 pi
There is one sigma as well as one pi bond in a double bond.
Sigma bonds and pi bonds are the two types of covalent bonds. Sigma bonds are formed when there is an end-to-end overlapping of the atomic orbitals. A pi bond is formed when there is a lateral or a side-by-side overlapping of the atomic orbitals.
The sigma bonds are represented by a "σ" symbol and pi bonds are represented by "π" symbol. One sigma bond is there in a single bond. A double bond contains one sigma as well as one pi bond. A triple bond has one sigma as well as two pi bonds.
--The given question is incomplete, the complete question is
"List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3pi, 1pi 1 sigma."--
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according to the department of transportation hazardous materials are defined as
Hazardous materials are substances or chemicals that pose a health hazard, a physical hazard, or harm to the environment.
What is hazardous materials?Weapons of mass destruction, as well as other matter or energy that have the potential to do harm to people, the environment, and property, when discharged.The EPA divides hazardous waste into three categories: listed, characteristic, and mixed radiological waste. Although there are numerous subclasses within each of these groups, the following are the broad groupings.Any cause of potential danger, harm, or negative health impacts on something or someone is a hazard. Basically, a risk is the potential for harm or a negative outcome (for example, to people as health effects, to organisations as property or equipment losses, or to the environment).A hazard is a potential source or circumstance that could cause harm to people or their health, damage to property, or harm to the environment.
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Write the chemical symbols for three different atoms or atomic anions with 10 electrons
Answer:
i) Neon (Ne)
ii) Fluoride Ion (F⁻¹)
iii) Oxide Ion (O⁻²)
Explanation:
Ions are those charged species which are either positively charged (by loosing electrons) called as cations or negatively charged (by gaining electrons) called as anions.
In given examples, Neon is a neutral atom which has an atomic number 10. It contains 10 electrons in its neutral state with the electronic configuration 1s², 2s², 2p⁶.
Fluorine atom has an atomic number of 9. Therefore, it contains 9 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁵. When Fluorine atom gains one electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶.
Oxygen atom has an atomic number of 8. Therefore, it contains 8 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁴. When Oxygen atom gains two electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶ forming an Oxide Ion.
8.0 mol AgNO3 reacts with 5.0 mol Zn in
a single replacement reaction.
2AgNO3 + Zn→ 2Ag + Zn(NO3)2
How many moles of Ag form from 5.0
mol Zn?
[?] mol Ag
Round your answer to the ones place.
The number of moles of Ag that forms from 5.0 moles of Zn is 10 moles.
How to calculate number of moles?The number of moles of a substance can be calculated stoichiometrically as follows;
Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, silver nitrate reacts with zinc to produce silver and zinc nitrate as follows:
2AgNO₃ + Zn → 2Ag + Zn(NO₃)₂
Based on the equation above, 1 mole of Zn produces 2 moles of silver.
Hence, 5 moles of Zn will produce 10 moles of Ag.
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What reagent causes the observed visual change in a positive Lucas test?
The observed visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic, in a positive Lucas test, is caused by the Lucas reagent.
The Lucas Test is used to detect the presence of a primary alcohol.
When the test is positive, the mixture of the primary alcohol with the Lucas reagent changes from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic. This visual change is due to the reaction of the primary alcohol with the Lucas reagent which is a mixture of concentrated hydrochloric acid and zinc chloride.
The Lucas Test is used to detect the presence of a primary alcohol, and when a positive result is obtained, the reaction of the primary alcohol with the Lucas reagent, a mixture of hydrochloric acid and zinc chloride, causes the visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy one.
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What are the 7 are elements?
The classical elements or seven elements in nature are plants, warm energy, soil, mineral, water, cold energy, and air.
Living organisms incorporate distinctly massive quantities of oxygen, carbon, hydrogen, nitrogen, and sulfur (those 5 factors are called the majority factors), together with sodium, magnesium, potassium, calcium, chlorine, and phosphorus (those six factors are called microminerals). From the smallest atom to a massive whale to the sun machine itself, all matters are stated to be composed of a few aggregate of those elements. Halogens belong to group 17, and they acquire only one electron in order to attain stable electronic configuration.
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In a titration experiment, a 12.5 mL sample of 1.75 x 10^-2 M Ba(OH) 2 just neutralized 14.5 mL of HNO 3 solution. Calculate the molarity of the HNO 3 solution.
The number of moles must be equal, the ratio of the molarity of each must be equal to the ratio of the volumes used.
What is experiment?An experiment is a procedure or set of procedures used to test a hypothesis or explore a cause and effect relationship. It is a scientific method of investigation in which the investigator manipulates one or more independent variables and measures the subsequent effect on one or more dependent variables. Experiments are conducted to answer questions, test theories, and gain insight into cause-and-effect relationships.
The molarity of the HNO 3 solution can be calculated using the equation:
Molarity of HNO3 = (volume of HNO3 * molarity of Ba(OH)2) / volume of Ba(OH)2
Molarity of HNO3 = (14.5 mL * 1.75 x 10^-2 M) / 12.5 mL
Molarity of HNO3 = 1.4 x 10^-2 M
This equation works because the number of moles of HNO3 neutralized by the Ba(OH)2 must be equal to the number of moles of Ba(OH)2 used. The number of moles of each can be determined by multiplying the molarity of each by the volume used, and since the number of moles must be equal
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While massing a hazardous solid on the balance, a lab student finds the amount taken is larger than needed and removes a small portion with a spatula. What is the recommended strategy for dealing with the excess material
As with any laboratory work, adequate facility design, operation, and monitoring, as well as excellent work practices, are necessary to protect laboratory staff against the hazard.
Both degrees of protection are based on the principle of ALARA (as little as reasonably possible) exposure. Electricity Risks By adopting adequate measures, the electrocution dangers of electrically powered instruments, tools, and other equipment are nearly completely minimized, therefore their use in the hazard need not represent a serious risk. You need the correct sort of scales if you want to weigh laboratory samples accurately. To accurately weigh the lab samples, for instance, you may use an analytical balance. The reliability of the weighing device will determine how accurate and precise the findings are.
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Which type of Electromagnetic wave has wavelength similar to the size of a 1 Peso coin
The microwave wavelength is the same as a one peso coin.
As you know, a peso coin is 24 mm in diameter. So the question becomes, what does an electromagnetic wave with a wavelength of 24mm look like? Wave velocity v, frequency f, and wavelength λ are related to each other. v=fλ
The velocity v in vacuum is the speed of light C₀ = 299792458 m/s. Therefore, the frequency is.
f=[tex]\frac{299792458m/s}{0,024m}[/tex] = 12.5GHz
This is commonly called microwave and its frequency is called Ku band. It is commonly used in satellite communications.
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Between what is expected and what actually happens?
Irony is a mismatch between what is expected and what actually occurs. These literary methods aid in the creation of dramatic effects in writing.
What is Irony?Irony is a disconnect between what is expected to happen and what actually happens. These types of literary devices help in creating a dramatic effect in literature.
Irony is a literary device which was used extensively in Greek tragedy. It involves expressing the meaning of something by making use of words which technically mean the opposite of the original thing being conveyed.
Irony is used for a dramatic or humorous effect. There are three types of irony seen in literature as follows:
• Verbal Irony
• Situational Irony
• Dramatic Irony
Verbal irony involves the usage of different words to mean something dissimilar to what they look like they actually mean.
Situational Irony means that what happens is totally different from what was expected to be happening.
Dramatic Irony occurs in plays, etc. where the audience or the readers are more aware of what is actually going on as compared to the character in the scene.
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Enzyme ______ bind to an enzyme to turn it off, thus preventing it from catalyzing a reaction. Multiple choice question
Enzyme Inhibitors bind to an enzyme to turn it off, thus preventing it from catalyzing a reaction.
An enzyme is a biological molecule that catalyzes chemical reactions in the cell. Enzymes work by lowering the activation energy required for a reaction to occur, making it more likely that the reaction will proceed. However, enzymes can also be inhibited, which means that their activity is reduced or stopped completely. This can happen for a variety of reasons, such as the presence of a specific molecule called an inhibitor.
Some inhibitors bind to the active site of the enzyme, preventing the substrate from binding and thus preventing the reaction from occurring. Other inhibitors bind to other parts of the enzyme, causing a conformational change that prevents the enzyme from working. Still, other inhibitors bind to enzymes and alter their activity by non-covalent interactions.
There are different types of inhibitors like competitive inhibitors bind to the active site of an enzyme and prevent substrate binding. Non-competitive inhibitors bind to a different site on the enzyme, causing a conformational change that makes the enzyme less active. Feedback inhibitors bind to the end product of a metabolic pathway, inhibiting the enzyme that catalyzes the first step of the pathway.
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A car has a mass of 2,050 kg and is traveling at 28 meters per second. What is the car's kinetic energy?
After solving the equation the car's kinetic energy is 783,500 kg m2/s2.
What is kinetic energy?Kinetic energy is the energy of motion, or the energy associated with an object or system due to its motion. It is a form of energy that can be converted into other forms of energy, such as thermal energy, sound energy, electrical energy, and so on.
The car's kinetic energy is the energy it has due to its motion. Kinetic energy is calculated as KE = 1/2mv2, where m is mass and v is velocity. In this case, the car has a mass of 2,050 kg and is traveling at 28 meters per second. Plugging these values into the equation gives:
KE = 1/2(2050 kg)(28 m/s)2
= 1/2(2050 kg)(784 m2/s2)
= 783500 kg m2/s2
Therefore, the car's kinetic energy is 783,500 kg m2/s2.
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A beautyberry is a type of shrub that grows well in the southern United States. Some students have a small beautyberry shrub that is growing near their school. They record the number of berries, ripe or unripe, and the number of flowers at different times throughout the year.
Table. Column headings. Month, ripe berries, unripe berries, flowers. September, 9, 4, 2. October, 5, 10, 4. November, 5, 7, 3. December, 2, 3, 1. February, 3, 2, 0. March, 6, 11, 5. April, 12, 5, flowers 9. June, 3, 8, 2.
Which statement best explains what is shown in their data?
Choose the correct answer.
Responses
A.The beautyberry relies on wind to spread its seeds.
B..The beautyberry relies on one type of animal to eat the berries.
C.The beautyberry uses asexual reproduction to make new plants.
D.The beautyberry increases its chances of reproduction because its berries do not all become ripe at the same time.
Note that statement best explains what is shown in the above-tabularized data is: "The beautyberry increases its chances of reproduction because its berries do not all become ripe at the same time. (Option D)
What is the rationale for the above answer?The statistics in the above table appear to reflect the ripening of berries and the number of blossoms of a plant, presumably called beautyberry. It can be noticed that the amount of ripe berries and blossoms varies each month.
This implies that the beautyberry does not produce all of its berries at once, but rather over the course of several months. This might boost the odds of reproduction by providing a food supply for animals and birds for a longer length of time.
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A compound with a molecular mass of 56.104 grams is found to be 86% carbon. The rest of the compound is hydrogen. Find its molecular formula. Group of answer choices C3H6 C4H8 C2H4 C6H10
The molecular formula for this compound is C4H8 that can be calculated from its empirical formula.
The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. The compound is made up of only carbon and hydrogen atoms thus it is known as hydrocarbon. The percentage of carbon is 86%, therefore the percentage of hydrogen is 14%.
The molecular mass of the compound is given i.e., 56.104 grams.
Moles of C= 86 g * 1 mol/12 g =7 moles
Moles of H=14 g* 1 mol/1 g= 14 moles
Thus, the mole ratio of C:H can be given as:
Moles of C/ Moles of H= 7/14=1/2
Thus, the empirical formula is CH2 while its molecular formula is C4H8.
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What happens to the molecules in the room as they change from a liquid to a gas?
When a liquid changes to a gas, the molecules in the room gain enough energy to break the bonds that hold them together in the liquid state.
What are Molecules?
Molecules are the smallest unit of matter that still has the properties of a particular substance. They are made up of two or more atoms that are bonded together. Molecules can be covalent, meaning the atoms in the molecule share electrons, or ionic, meaning one atom has donated electrons to the other.
This energy comes from an increase in temperature, which causes the molecules to move faster and farther apart. As the molecules move around and expand, they fill the room with a vapor or gas.
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What is the freezing point of the solution after you add an additional 1. 34 g (Use i = 2. 5 for MgCl2)
The freezing point of the solution after you add an additional 1.34 g is -0.808°C.
What is freezing point of a solution?A solution's freezing point is lower than the pure solvent's freezing point. This means that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.
We use the equation: to determine the mass of the solution
Density = mass/volume
1.05 g/ml = mass/ 50ml
mass = 1.05×50
mass = 52.5g.
Percentage of magnesium chloride in the solution is 1.52%
Mass of magnesium chloride in the solution = 1.52 % of 52.5 g
Mass of magnesium chloride in the solution = 1.52/100×52.5
Mass of magnesium chloride in the solution = 0.798g
The following equation is used to determine depression in freezing point:
ΔTf = Freezing point of pure solution - Freezing point of solution
ΔTf = i Kf m
Freezing point of pure solution - Freezing point of solution = i Kf m
m = m solute × 100/M solute × W solvent
Given values,
Freezing point of pure solution (water) is 0°C
i is Vant hoff factor = 2.5
Kf molal freezing point elevation constant = 1.86°C/m
m solute given mass of solute (magnesium chloride) = [0.798 + 1.34] g
m solute = 2.138 g
M solute molar mass of solute (magnesium chloride) = 95.2 g/mol
W solvent mass of solvent (water) = [52.5 - 0.798] g = 51.702 g
substitute the given values,
0 - Freezing point of solution = 1×1.86×2.138×1000/95.2×51.702
Freezing point of solution = -0.808°C.
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Complete question is " A 50 mL solution is initially 1.52% MgCl₂ by mass and has a density of 1.05 g/ml
What is the freezing point of the solution after you add an additional 1.34 g MgCl₂? (Use i = 2.5 for MgCl₂)."
What causes pressure inside a helium balloon?
OA. The helium atoms exert an electrostatic force that pushes the
surface outward.
OB. The helium atoms expand and press on the surface of the balloon.
OC. The helium atoms bounce off the surface as they move inside the
balloon.
OD. The helium atoms stick to the surface of the balloon and increase
its weight.
Pressure inside a helium balloon: The helium atoms expand and press on the surface of the balloon.
What is helium balloon?Helium balloons are a type of balloon filled with helium gas. Helium is a light, non-flammable, inert gas that is found in abundance in the atmosphere and is used to inflate balloons. Helium balloons are often used in decorations, promotions, special events, parties, and displays. They come in a variety of shapes, sizes, and colors, and can be filled with helium and released into the atmosphere, creating a festive atmosphere. Helium balloons are also used in scientific experiments, such as measuring wind speeds, studying atmospheric pressure and air movement, and measuring the temperature of the atmosphere.
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Everyone!
Give a Question/Problem for Hot and Cold Compress Pillow
Thank you!!
Answer:
are u good at geometry math? their are some questions I didn't understand it PLEASE
Which component of the periodic table is needed to determine why KCl tastes like NaCl? A. Group B. Period C. Atomic Weight D. Atomic Number
Atomic Number of the periodic table is needed to determine why KCl tastes like NaCl.
What is the Periodic Table?
The Periodic Table is a tabular arrangement of the chemical elements organized by atomic number, electron configuration, and recurring chemical properties. It is one of the most important tools in chemistry, providing a useful framework to classify, systematize, and predict the properties of elements.
Atomic numbers are used to identify each element in the periodic table, and they are also used to determine the number of protons in the nucleus of an atom. The number of protons in an atom determines its chemical properties, and the similarity in the number of protons between two elements can explain why they have similar properties. In this case, the similarity in the atomic number of potassium (K, atomic number 19) and sodium (Na, atomic number 11) explains why the salts of both elements, potassium chloride (KCl) and sodium chloride (NaCl), taste the same.
Hence, Option D is correct.
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Predict the ideal bond angles in GeCl4 using the molecular shape given by the VSEPR theory
>120°
109.5°
120°
<120°
>109.5°
90°
< 109.5°
180°
Predict the ideal bond angles in GeCl4 using the molecular shape given by the VSEPR theory is 109.5°.
Germanium tetrachloride has an odd, acidic smell and is a colorless, fuming liquid. It is a necessary step in the creation of pure germanium metal. GeCl4 has seen a significant rise in utilization recently as a result of its employment as a reagent in the creation of fiber optics. GeO2 (germanium dioxide) may be immediately converted into germanium tetrachloride by dissolving the oxide in strong hydrochloric acid. To purify and remove the germanium tetrachloride from other products and contaminants, the resultant liquid is fractionally distilled. Rehydrolyzing the GeCl4 with deionized water will yield pure GeO2, which may then be reduced with hydrogen to get germanium metal.
complete question:Predict the ideal bond angles in GeCl4 using the molecular shape given by the VSEPR theory
109.5°
90°
120°
180°
< 109.5°
>109.5°
<120°
>120°
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if elements have the same number of valence electrons, they are
a) called halogens
b) called noble gases
c) in the same group
d) in the same period
Answer:
c
Explanation:
valence is the number of electrons in the outer most she'll.. therefore all elements in the same group have the same valences for example group one elements have a valence of one
I hope this helps
Investigating Jessie's Claim
Identifying the Other Reactant
If the container was not empty when Jessie added the chlorine gas, then what could have been inside it? Below is an image
showing the reaction inside the container. There is also a table that lists some of the substances that Dr. Yung keeps in her lab.
The group of atoms that repeat to form each substance, as well as some of the properties of each substance, are included in the
table.
Procedure
1. Use the tokens and the information in the table to determine what the other reactant inside the container could have been.
2. Once you have identified the other reactant, answer the questions below.
A 13.1-g sample of ice at −17.9°C is mixed with 103.5 g of water at 73.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.03 and 4.18 J/g·°C, respectively, and the enthalpy of fusion for ice is 6.02 kJ/mol.
The final temperature of the mixture when no heat loss to the surroundings is equal to 69.57 °C
What is the specific heat capacity?The specific heat capacity can be defined as the amount of heat required to increase the temperature in 1 unit of substance by 1° Celcius.
The specific heat capacity can be expressed in the form of the mentioned formula below:
Q = mSΔT
The specific heat capacity of the water, S = 4.184 J/g°C
The heat lost by water = heat gained by the ice
Heat lost by water = heat gained by the ice + heat increased by the water
m₁S₁ (T₂ - T₁) = m₂L + m₂S₂ (T₂ - T₁)
103.5 × 4.18 × (73- T) = 13.1 × (2.03) + 5 × 4.18 × (T-0)
31582 - 432.63 T = 26.59 + 20.9 T
453.53 T = 31555
T = 69.57 °C
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If 1.70g of aniline reacts with 2.10g of bromine, what is the theoretical yield of 4-bromoaniline (in grams)
If 1.70g of aniline reacts with the 2.10 g of bromine, the theoretical yield of 4-bromoaniline is 2.25 g.
1 mole mole of the aniline react with the 1 mol of Br₂ produces 1 mole of the 4 - bromoaniline.
mass of aniline = 1.70 g
molar mass of aniline = 93 g/mol
moles of aniline = 0.0182 mol
mass of Br₂ = 2.10 g
molar mass of Br₂ = 160 g/mol
moles = 2.10/ 160
= 0.0131 mol
Br₂ is limiting reagent .
moles of 4-bromoaniline = 0.0131
mass of 4-bromoaniline = moles × molar mass
= 0.0131 × 172
= 2.25 g
Thus, the theoretical yield is 2.25 g.
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(05.04 LC)
How many moles of sulfuric acid (H₂SO4) are needed to react completely with 6.8 moles of lithium hydroxide (LiOH)?
2LIOH + H₂SO4 → Li2SO4 + 2H₂O
O 3.4 mol H₂SO4
O 6.8 mol H₂SO4
O 10.2 mol H₂SO4
O 13.6 mol H₂SO4
3.4 mole of H₂SO₄ are needed to react completely with 6.8 moles of lithium hydroxide (LiOH).
Is lithium hydroxide harmful to humans?When breathed in, lithium hydroxide monohydrate can have an impact on you. Lithium Hydroxide Monohydrate is a HIGHLY CORROSIVE CHEMICAL, and contact with it can cause serious skin irritation, eye damage, and burning. Lithium Hydroxide Monohydrate inhaled can irritate the throat and nose.
From the stichiometry of the reaction: 2 LiOH + H2SO4 → Li2SO4 + 2H2O
It is evident that 2.0 moles of LiOH reacts with 1.0 mole of H2SO4 to produce 1.0 mole of Li2SO4 and 2.0 moles of H2O.
Using cross multiplication:
1.0 mole of H2SO4 reacts completely with → 2.0 moles of LiOH
x mole of H2SO4 are needed to react completely with → 6.8 moles of LiOH
since number of moles of H2SO4 = ( 1.0 x 6.8 ) / (2.0) = 3.4 mole of H2SO4.
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