To determine the volume of gaseous water collected use the balanced chemical equation and the concept of stoichiometry. The balanced equation for the reaction is 2H2(g) + O2(g) → 2H2O(g).
From the equation, we can see that 2 moles of H2 react with 1 mole of O2 to produce 2 moles of H2O.
Given that we have 8.6 L of H2 and 5.3 L of O2 at STP (Standard Temperature and Pressure), we can use the ideal gas law to convert the volumes to moles.
At STP, 1 mole of any ideal gas occupies 22.4 L.
Moles of H2 = 8.6 L / 22.4 L/mol = 0.3846 mol
Moles of O2 = 5.3 L / 22.4 L/mol = 0.2366 mol
Based on the balanced equation, we can see that the ratio of moles of H2O to O2 is 2:1. Therefore, the moles of H2O produced will be half the moles of O2.
Moles of H2O = 0.2366 mol / 2 = 0.1183 mol
Now, to convert the moles of H2O to volume, we use the ideal gas law again: Volume of H2O = Moles of H2O × 22.4 L/mol = 0.1183 mol × 22.4 L/mol = 2.647 L. Therefore, the volume of gaseous water collected is approximately 2.647 liters.
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Can someone solve this for me, please ?
5. The formula for a substance is D, and its molar mass is 30 g. A student is given 150 g of the substance and is asked how many atoms are in the sample. She says there are 5 times Avogadro's number (6.022 x 102) of atoms in her sample. The student is in error, identify her error and explain what the correct answer should be.
Answer: Example: Find the molecular of the water molecule. Solution: The formula of the water molecule is H₂O. The atomic mass of hydrogen = 1 amu. The atomic mass of oxygen = 16 amu. Molar mass of water = 2 *1 + 16 = 18 amu. Example: What will be the relative molar mass of the hydrogen molecule. Solution: Hydrogen molecule represented by H₂.
hope this works
caused by the intense heat that comes from the surfaces of streets roofs of buildings. Iker convinces his teacher to do an experiment. V of other students, Iker builds a rooftop garden to cover one half of building. For one semester, Iker records the air temperature on the building with the rooftop garden and the half of the building witho garden. He finds that the average temperature near the rooftop ga The average temperature away from the garden is 29°C.Iker is worried about global warming. He believes that much of the problem is caused by the intense heat that comes from the surfaces of streets and the roofs of buildings. Iker convinces his teacher to do an experiment. With the he of other students, Iker builds a rooftop garden to cover one half of his school building. For one semester, Iker records the air temperature on the half of the building with the rooftop garden and the half of the building without the garden. He finds that the average temperature near the rooftop garden is 23° The average temperature away from the garden is 29°C.
The manipulated variable in the global warming experiment is the air temperature.
The correct option is B.
What are the variables in an experiment?Anything that is changeable is referred to as a variable. In other words, it's anything that can be changed, taken into account, or quantified in an experiment.
There are three types of variables in an experiment:
Independent variable or manipulated variableDependent variableConstant variableIn the given experiment, the manipulated variable was the change in the location.
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draw correct structure for benzaldehyde
The chemical formula for benzaldehyde is C6H5CHO.
Benzaldehyde is an arenecarbaldehyde composed of benzene with a single formyl substituent. The simplest aromatic aldehyde and family tree of the benzaldehyde class. It acts as a flavoring agent, fragrance, olfactory receptor agonist, and plant metabolite. The main effect of occupational exposure to benzaldehyde is irritation of the skin, eyes, and mucous membranes of the respiratory tract. Benzaldehyde is primarily used as a food and flavoring additive and can be found in many foods, including baked goods, frozen dairy products, fruit juices, soft candies, jelly puddings, soft drinks, alcoholic beverages, candies, and chewing gum. The chemical structure of benzaldehyde has benzene and aldehyde groups.
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im crying guys I dont understand
The following data was collected when a reaction was performed experimentally in the laboratory.
Reaction Data
Reactants Products
Fe2O3 Al Al2O3 Fe
Starting Amount in Reaction 3 moles 5 moles ? ?
Determine the maximum amount of Fe that was produced during the experiment. Explain how you determined this amount.
The experiment will only result in a maximum of 280 grams of iron (Fe) being produced.
Iron is what?The mineral iron is essential to our bodies for a number of processes. As an illustration, iron is a constituent of hemoglobin, a chemical that transports oxygen from our lungs to each and every tissue in our bodies. It helps our muscles get oxygen and store it. Iron is also present in many other enzymes and enzymes. Your body needs iron in the right amount.
How does the body use iron?Another form of protein called hemoglobin, which is present throughout red plasma cells and carries the oxygen from your lungs to every of the body, contains a sizable quantity of iron. If the body doesn't have enough iron, it won't produce enough red blood cells to deliver oxygen, which leads to fatigue.
equation of the reaction:
Fe₂ O₃ + 2Al --> 2Fe + Al₂ O₃
mole ratio of Fe₂ O₃ to Al = 1:2
5 moles Fe = 5 x 56
= 280 grams
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If chemicals are transferred to secondary containers, the secondary containers must be labeled with the chemical's. True or False?
TRUE , Auxiliary containers must be labeled, excluding a few circumstances. LABEL IT IF If a secondary container was transportable, for instance, you are frequently exempt from label requirements.
What does an OSHA secondary container mean?Chemicals are typically transferred from primary container to secondary containers while within the workplace. These smaller containers can be spray bottles, containers, aliquots, or jars. OSHA states that secondary containers must adhere to the labeling specifications.
What is required for a secondary container?The identification of the product's hazardous substances and any physical, health-related, nor environmental risks that may be posed by its constituent parts are the two pieces of information that must be provided on the secondary labels.
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A student accidentally added 15 mL of HCl to the eudiometer instead of 10 mL. What effect would this have on the volume of hydrogen gas produced? Would the calculated molar volume of hydrogen be too high, too low or not affected as a result of this error? Explain.
Balanced Equation: 2HCl + Mg ---> H2 + MgCl2
The calculated amount of the hydrogen that is produced would be too low.
What effect would this have?We should know that the question that we have here is going to so much border on the stoichiometry of the reaction. In this case, we are having the fact that A student accidentally added 15 mL of HCl to the eudiometer instead of 10 mL.
We know that the amount of the hydrogen that is produced would depend on the amount of the acid that is added and if an excess amount is added, the calculated amount would be too low because of this error.
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If you were to prepare exactly 1.00 L of a 5 M NaCl solution, you would not need exactly 1.00 L of water. Explain.
A 1 liter volumetric flask can be filled with distilled water until it reaches the graduation mark, 58.44 g of NaCl and this amount of salt can be used to create a 1M solution of the salt.
How would you make 1 liter of a 1M solution of NaCl?In this case, we must determine the volume of the solution as well as the mass of sodium chloride (NaCl) required to make a 1 molar solution of the salt.
The molarity formula,
Molarity=Moles of Solute Volume of Solution, must be used.
The whole solution, in steps:
The moles of NaCl must first be determined. The solution has a 1 M molarity and a 1 L volume.
As a result, moles of NaCl may be computed as,
1 liter of solution equals 1 mole of NaCl.
1 M x 1 L equals 1 mol of NaCl.
In light of this, there is one mol of NaCl in the solution.
Using the quantity of NaCl's moles, we must now determine the mass of NaCl.
Math processing error: Number of moles
58.44 g/mol is the molar mass of sodium chloride, which has a molecular weight of 1 mol.
Processing Error in Math
(Math Processing Error)
Processing Error in Math
So, to create a 1 M solution, we'll need 58.44 g of NaCl.
We will now talk about making a NaCl solution at a single molar strength.
A 1 liter volumetric flask can be filled with distilled water until it reaches the graduation mark, 58.44 g of NaCl and this amount of salt can be used to create a 1M solution of the salt.
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Write the formula for the Molecular Compounds
Molecular compounds are formed by covalent bonds between two nonmetal atoms. The formula for molecular compounds is AB, where A and B are the two nonmetal elements.
What is molecular compounds?Molecular compounds are formed when two or more atoms join together to form a single molecule. They are held together by a strong chemical bond known as a covalent bond. The atoms can be from the same element or from different elements. Examples of molecular compounds include water, carbon dioxide, and methane. Molecular compounds are essential for life and are found in many everyday products. For example, table sugar is a molecular compound made up of carbon, hydrogen, and oxygen atoms.
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What is the molality of a solution containing
10.0g Na2SO4 dissolved in 1000.0g of water?
Answer:
Explanation:
Use the definition of molality to guide you to find what is needed to solve for molality.
molality = mol of solute/kg of solvent
Step 1: Find molar mass of Na2SO4
Na: 2 x 23.00 g = 46.00 g
S: 1 x 32.06 g = 32.06 g
O: 4 x 16.00 g = 64.00 g
Molar mass of Na2SO4 = 142.06 g/mol
Step 2: Convert 10.0 g Na2SO4 into moles using molar mass of Na2SO4 from step 1.
10.0 g x (1 mol/142.06 g) = 0.070393 mol
Note that grams cancel and you are left with moles.
Step 3: Convert 1000.0 g of water into kilograms of water. Remember that 1000 g = 1 kg.
1000.0 g x (1 kg/1000g) = 1.0000 kg water
Note that grams cancel and you are left with kilograms.
Step 3: Use the definition of molality to find molality for this solution. The solute is Na2SO4. The solvent is water.
Definition of molality = mol of solute/kg of solvent
molality = 0.070383 mol/1.0000 kg
molality = 0.070393 m
There are 3 significant figures in 10.0 g and 5 significant figures in 1000.0 g. Use the least number of significant figures when multiplying or dividing. In this case 10.0 g has the least number of significant figures. The final answer with the correct number of significant figures is 0.0704 m.
Which of the following cell structures do eukaryotes and prokaryotes have in common? (4 points)
a
Flagellum
b
Nucleus
c
Nucleoid
d
Ribosome
The answer to the question is D: Ribosome
An ion has 13 electrons, 12 protons, and 14 neutrons. What is the mass of the ion?
a. 14 u
b. 25 u
c. 26 u
d. 27 u
The mass of an ion that has 13 electrons, 12 protons, and 14 neutrons is 26 u (option C).
What is mass number?Mass number of an element is the total number of protons and neutrons in an atomic nucleus.
The number of protons and electrons of an atom is the number of positively charged and negatively charged subatomic particles in an atom respectively.
According to this question, an ion has 13 electrons, 12 protons, and 14 neutrons. The mass number can be got by summing the number of neutrons and protons in the atom as follows:
mass no = 12 + 14 = 26u
Therefore, 26 u is the mass of the ion described in this question.
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How will you calculate the partial pressure of gas using Dalton's Law of partial pressures?
The overall pressure exerted by a mixture of non-reactive gases is equal to the sum of the partial pressures of the individual gases, according to Dalton's Law, also known as Dalton's Law of Partial Pressures.
The partial pressure law of Dalton states that
The sum of the partial pressures of the various gases determines the overall pressure that a mixture of gases exerts.
mathematical formula:
P(total) = P1 + P2 +... P (n)
P1 = One gas's partial pressure
P2 is the second gas's partial pressure.
Pn is the partial pressure of n gases.
so to find the patial pressure can be cal culate as follows
P (n)= P(total) - P1 + P2+....
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what is created when the e-liquid or tobacco is heated in a vaping device?
When the e - liquid or the tobacco is heated in a vaping device , it will produces the aerosol. The user inhale the aerosol in their lungs.
The e - liquid or the tobacco when heated too much it will produces the aerosol. The e - cigarettes results in the production of the aerosol , when it heated too much. The liquid it contain is nicotine. The drugs cigarettes , the cigar and tobacco , flavoring helps to produces the aerosol.
Thus, when the e - liquid is heated too much it will results in the production of the aerosol.
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How much time will it take a snail to travel 10 meters across the floor if it’s traveling at 2m/s
5 seconds. 5x2=10.
(Don't know why you asked this here, the math is really simple)
The major chemical structures of hormones include
a. polysaccharides, esters, and steroids.
b. only molecules containing amine groups.
c. steroids, amino acid derivatives, and esters.
d. steroids, polypeptides, and anino acid derivatives.
e. only steroids.
Only steroids are included in the principal chemical structures of hormones. How atoms are organized within molecules is referred to as chemical structure.
What mechanisms govern chemical structures?By showing the spatial arrangement the atoms and chemical bonds within the molecule, chemical structure describes how a compound's molecular geometry is formed. A crucial visual depiction of a molecular formula is thus given to scientists in this way. The chemicals known as enantiomers are chiral and mirror-imaged.
How can chemical structures be distinguished?When determining the structures of chemical compounds, one often strives to determine the pattern and strength of bonding between all of the atoms in the molecule; if possible, one also looks for the three-dimensional spatial coordinates of a atoms in the molecule.
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An organic synthesis to make the pain reliever acetominophen is supposed to produce 280 kg of product but instead produces 70 kg of waste in addition to the acetaminophen. what is the percent yield?
The theoretical yield in this instance is 280 kg, however the actual yield is only 70 kg. Consequently, the percent yield is calculated as follows: 25% = 70/280 x 100.
How do you find percent yield?We apply the following formula to determine the yield percentage: percent yield = actual yield/theoretical yield x 100.The percentage yield indicates how much product is produced in relation to the maximum mass that may be produced. The percentage of atoms in reactants that go on to generate the intended product is determined by the atom economy of a reaction.The efficiency of a chemical process is gauged by percentage yield. It provides us with information on the percentage of our reactants that effectively converted into a product.Percent yield is a metric that contrasts the amount of product we actually generate with the amount we predict we should produce. There will always be a small amount of product left over after a reaction in a genuine lab. How close we can come is indicated by percent yield.To learn more about yield refer to:
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Help me find the percent composition on this element
C12H22O11 has a mass composition of 42.1 percent, 6.48 percent hydrogen, and 51.4% oxygen.
What is Mass Composition?By comparing an element's molar mass to the total molar mass of the compound as a whole, mass percent composition can be calculated. The final result of the calculation is a percentage that can be used to compare various compounds.
The exact number of atoms in the compound is shown by this formula.
The equation to calculate the percentage composition by mass of sodium is given below:
The exact number of atoms in the compound can be seen in this formula: mass of sodium = (22.99 g/mol) x (1 mole NaOH / 40.00 g/mol) = 0.5747 g % mass of sodium = (0.5747 g / 40.00 g/mol) x 100 = 1.43 % We can use the following equation to determine the percentage of the compound composed of oxygen by mass:
(mass of oxygen / molar mass of NaOH) x 100 = oxygen percentage = (16.00 g/mol) x (1 mole NaOH / 40.00 g/mol) = 0.400 g Oxygen percentage = (0.400 g / 40.00 g/mol) x 100 = 1.00% We can use the following equation to determine the percentage of hydrogen by mass:
(mass of hydrogen / molar mass of NaOH) x 100 = % mass of hydrogen % mass of hydrogen = (1.01 g/mol) x (1 mole NaOH / 40.00 g/mol) = 0.02525 g % mass of hydrogen = (0.02525 g / 40.00 g/mol) x 100 = 0.063% Na, 1.00% O, and 0.063% H The compound C12H22O11 has a We can use the same approach as before to determine the percentage of C12H22O11's elements by mass.
Mass of Carbon = (1212.01) = 144.12 g Mass of Hydrogen = (221.01) = 22.22 g Mass of Oxygen = (11*16) = 176 g % Mass of Carbon = (144.12 / 342.30) x 100 = 42.1% % Mass of Hydrogen = (22.22 / 342.30) x 100 = 6.48% % Mass of Oxygen = (176 / 342.30) x 100.
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If 100 grams of Au-198 decays to 6.25 grams in 10.8 days, what is the half like
Answer:2.7
Explanation:
What is ethanol? how can it improve global climate change?
Ethanol, a type of grain alcohol that may be combined with gasoline and used in vehicles, is beneficial to the environment because it is a renewable fuel that is produced from biomass.
Additionally, ethanol burns cleaner and more thoroughly than either gasoline or diesel. Carbon dioxide is removed from the atmosphere as the grain or biomass used to produce ethanol takes it in as part of its growth process, making ethanol a cleaner alternative to gasoline.
By using grain-based ethanol instead of gasoline, greenhouse gas emissions can be reduced by 44-52%, as reported by the Argonne National Laboratory of the United States Department of Energy. Similarly, a team of experts from Harvard, MIT, and Tufts found that modern corn ethanol reduces greenhouse gas emissions by 46% compared to gasoline.
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How many grams (g) are in 4.25 moles of Magnesium Chloride (MgCl2) ?
One mole of magnesium chloride has a mass of 95 g. Then the mass of 4.25 moles of magnesium chloride (MgCl₂) is 403.7 g.
What is magnesium chloride ?Magnesium chloride is an ionic compound with the chemical formula, MgCl₂. It formed through the donation of two valence electrons from the metal magnesium to the chlorine atoms.
The mass of one mole of a compound is called its molar mass. The number of moles of the compound is then the ratio of its given mass to the molar mass.
Atomic mass of Mg = 24 g/mol
atomic mass of Cl = 35.5 g/mol
mass of 2 Cl = 71 g
Then, molar mass of MgCl₂ = 24 + 71 g = 95 g/mol
One mole of MgCl₂ is 95 g. Then, mass of 4.25 moles of MgCl₂ is
4.95 × 95 = 403.7 g
Therefore, the mass of 4.95 moles of MgCl₂ is 403.7 g.
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What type of irony is when what we expect to happen is not what actually happens?
This type of irony called situational irony occurs when the expected outcome of a situation is completely opposite of what actually happens.
It is an unexpected twist of fate, where the actual outcome is in direct conflict with what was originally intended or expected. This type of irony is often used in literature to create suspense and humor, as the audience is often shocked and surprised by the unexpected ending.
Situational irony can also be used to highlight a greater theme or message in a story, such as the idea that life can be unpredictable and that sometimes the outcome of a situation is completely unexpected.
This type of irony is also often used in comedy, as the audience is taken by surprise when a joke is turned on its head and the expected outcome does not happen.
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2.0 moles of gas occupies 44.8 L
at STP. What volume is required
to hold 6.0 moles of gas?
Answer:
134.4 L
Explanation:
At standard temperature and pressure (S.T.P) one mole of any given gas occupies 22.414 dm^3 or 22.414 L (as 1 dm^3 = 1 L ).
So 2 moles at S.T.P would occupy: 2 x 22.414 L = 44.8 L
Similarly,
6 moles of a gas at S.T.P would occupy: 6 x 22.414 = 134.4 L
Answer: 134.4 L
Explanation:
6 moles of a gas at S.T.P would occupy: 6 x 22.414 = 134.4 L
What is absorption in digestion and why is it important?
Absorption in digestion is the absorption of nutrients from the small intestine and it is important so that they can be used as energy by the body.
The digestive system is a process carried out by the digestive organ system to process food so that its nutrients can be absorbed by the body and converted into energy.
Absorption is the process of absorbing simple molecules/nutrients through the epithelial cells and villi that comprise them which are then carried into the bloodstream.
The small intestine is part of the digestive tract that completes the digestive process and absorbs nutrients. After food is completely digested both chemically by enzymes, most of the nutrients will be absorbed in the jejunum into the bloodstream which is then used for body energy. Nutrients are used by the body for growth and development, if the intestines cannot absorb nutrients, the body will not have the energy to grow and develop.
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Which particles
have a mass
of 1AMU each?
Answer:
Both neutrons and protons
Explanation:
Both neutrons and protons are assigned as having masses of 1 amu each. In contrast, the electron has a negligible mass of . 0005 amu.
what is the volume, measured in liters at STP, of 285 grams of the gas acetylene, C2H2?
285 grams of acetylene at standard temperature and pressure (STP) have a volume of 24.45 liters.
How to find the volume of a gas?To find the volume of a gas at standard temperature and pressure (STP), you can use the ideal gas law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.
STP is defined as 0 °C (273.15 K) and 1 atm (101.325 kPa)
First, we need to find the number of moles of acetylene. To do this, we use the molar mass of C2H2 which is 26.04 g/mol
n = m / M
n = 285 g / 26.04 g/mol
n = 10.9 moles
Then we can use the ideal gas law to find the volume in liters:
V = nRT / P
V = (10.9 moles) * (0.08206 Latmmol^-1*K^-1) * (273.15 K) / (101.325 kPa)
V = 24.45 L
Therefore, 285 grams of acetylene at standard temperature and pressure (STP) have a volume of 24.45 liters.
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How much silver can you make with 50 grams of AgCl?
50 grams of AgCl (Silver Chloride) will produce 39.2 grams of silver when the AgCl is processed.
What is Silver Chloride?Silver chloride (AgCl) is an inorganic compound composed of silver and chlorine. It is a white powder or crystalline solid that is insoluble in water, alcohol, and other organic solvents. Silver chloride is used mainly in photography and in the production of specialized glass. Silver chloride has been used in the past to make silver plating, silver salts and silver jewelry. Silver chloride has been used in various medical treatments, including eye drops and ointments, as an antiseptic and to treat skin disorders.
The process involves reacting the AgCl with either a reducing agent or a disproportionation reaction. The reaction produces Ag (silver) and Cl2 (chlorine gas). The silver produced accounts for approximately 78.4% of the original AgCl mass. Therefore, 39.2 grams of silver can be produced from 50 grams of AgCl.
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What is the total moles of 4.82 x 1024 atoms of helium gas?
(A) 2.00 moles (B) 4.00 moles (C) 6.00 moles (D) 8.00 moles
8.00 moles is the total moles of [tex]4.82 * 10^2^4[/tex] atoms of helium gas. So, the correct option is (D).
What are Moles?The mole is defined as the amount of matter of a system containing as many elementary elements as atoms in 0.012 kg of carbon 12; Its symbol is "Mol". It consists of the amount of a substance which is [tex]6.022 * 10^2^3[/tex] units like particle, atom, ion, molecule etc. of the given substance where a mole measures the number of atoms, ions or molecules.
[tex]Number of moles= \frac{Number of molecules}{Avogadro's number}[/tex]
For above given information,
[tex]Number of moles=\frac{4.82 * 10^2^4}{6.023* 10^2^3}[/tex]
= 0.8002*10= 8.002 moles
Thus, 8.00 moles is the total moles of [tex]4.82 * 10^2^4[/tex] atoms of helium gas. So, the correct option is (D).
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The total moles of 4.82 x 10²⁴ atoms of helium gas is 8 moles . Hence, option (D) is correct.
What is Avogadro constant?The Avogadro constant is a proportionality factor that compares the number of constituent particles (typically molecules, atoms, or ions) in a sample to the amount of substance in that sample.
1 mole of Helium gas has 6.02 × 10²³.
Hence, 4.82×10²⁴ atoms of Helium gas refers = ( 4.82×10²⁴ ÷ 6.02 × 10²³) moles of helium gas
= 8 moles of helium gas.
The total moles of 4.82 x 10²⁴ atoms of helium gas is 8 moles .
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1. Calculate the molar mass of sugar (sucrose: C12H22O1 )
2. What is the percent composition of carbon in sucrose?
3. What is the percent composition of hydrogen in sucrose?
4. What is the percent composition of oxygen in sucrose?
Answer:
1. 342g/mol2. 42.1%3. 6.43%4. 51.46%Explanation:
Greetings !!!
First let's define the meaning of molecular mass.
Molar mass M is the mass of a chemical compound divided by its amount-of-substance measured in moles. It is defined as MB = m/nB, where m is the total mass of a sample of pure substance and nB is the amount of substance B given in moles. The definition applies to pure substance.
For the first question
solution
The atomic mass of carbon(C)= 12
The atomic mass of Hydrogen(H)= 1
The atomic mass of Oxygen(O)= 16
Molecular mass of sucrose(Table sugar)C₁₂H₂₂O₁₁=
12×(The atomic mass of carbon(C)) + 11×(The atomic mass of Hydrogen(H)) + 11×(The atomic mass of Oxygen(O))
Molecular mass of sucrose = 12×12+22×1+11×16
=144 + 22 + 176
=342g/mol
Secondly, when we look at percent composition first let's define it :-
Percent CompositionFind the molar mass of all the elements in the compound in grams per mole. Find the molecular mass of the entire compound.Divide the component's molar mass by the entire molecular mass.You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.So, let's work on the questions
%Compositions
Carbon= 144/342×100 = 42.1%
Hydrogen = 22/342×100= 6.43%
Oxygen = 176/342×100= 51.46%
And to be more sure add those percent values
Thus, 42.1%+6.43%+51.46%= 99.99%
If you have any questions and unclear ideas tag it on comments
Hope it helps!!
2 Al + 3CuCl₂ --> 2 AlCl3 + 3 Cu
How many grams of Al do you need to make 15 g of AICI3? Remember
to round all molar masses to whole numbers.
(round to the hundredths place)
Molar mass: According to the answer you need 3.0 g of Al to make 15 g of AlCl3.
What is Molar mass?Molar mass is the mass of a given substance (chemical element or compound) divided by the amount of substance in moles. It is usually expressed in grams per mole (g/mol). Molar mass is an important concept in chemistry, as it is used to calculate the mass of a substance from the amount of moles of the substance. It is also used to calculate the amount of moles of a substance from the mass of the substance. Molar mass is also used to calculate the density of a substance, as well as the molar volume of a substance.
Molar mass of Al = 27 g/mol
Molar mass of AlCl3 = 133 g/mol
To make 15 g of AlCl3, you need 15/133 = 0.112 mol of AlCl3.
To make 0.112 mol of AlCl3, you need 0.112 mol of Al.
Therefore, you need 0.112 mol of Al x 27 g/mol = 3.0 g of Al.
Therefore, you need 3.0 g of Al to make 15 g of AlCl3.
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Calculate the molar concentrations of the ions in each solution
18g of sodium sulfate, Na2SO4(s), dissolved in 210 mL of solution
The molarity of the sodium ion is 0.31 M while the molarity of the sulfate ion is 0.62 M.
What is the molarity?First of all, we would have to establish that the molarity would be the same as the concentration of the substance. We know that we can be able to obtain the concentration from the number of moles and the volume of the solution thus we would need to use the mass the substance that we have to be able to obtain the number of moles of the solution that we have.
Mass of the sodium sulfate = mass/molar mass
18 g/142 g/mol
= 0.13 moles
Now we know that;
Molarity of the substance = 0.13 moles/0.21 L
= 0.62 M
Number of moles of the sodium ions = 0.62 M/2 = 0.31 M
Number of moles of the sulfate ions = 0.62 M
These are the ions in the solution.
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