24.9 ml of 0.112 M Pb(NO3)2 is needed to react with 20.0 ml of 0.105 M KI.
Using the balanced chemical equation, we can determine that 1 mole of Pb(NO3)2 reacts with 2 moles of KI to produce 1 mole of PBI2 and 2 moles of KNO3.
First, we can calculate the number of moles of KI present in the solution:
0.105 M KI x 0.0200 L = 0.00210 moles KI
Since 1 mole of Pb(NO3)2 reacts with 2 moles of KI, we need half as many moles of Pb(NO3)2 to completely react:
0.00210 moles KI ÷ 2 = 0.00105 moles Pb(NO3)2
Finally, we can use the molarity and volume of the Pb(NO3)2 solution to determine the amount needed:
0.00105 moles Pb(NO3)2 ÷ 0.112 mol/L = 0.00938 L = 9.38 mL
Therefore, 24.9 mL of 0.112 M Pb(NO3)2 is needed to completely react with 20.0 mL of 0.105 M KI.
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Why is the temperature of the liquid in the flask on the previous page measured when the liquid in the thermometer has stopped rising?.
The temperature of the liquid in the flask on the previous page measured when the liquid in the thermometer has stopped rising to measure confirmed or fixed temperature.
When the liquid in the flask is heated, its temperature rises, and when a thermometer is inserted into the flask to gauge the liquid's temperature, the liquid within the thermometer also begins to warm up.
The temperature of the liquid rises as a result of heat being transferred from a high temperature to a low temperature until the temperatures are equal. Therefore, when the liquid stops rising, both are at the same temperature, and this is how the liquid in the flask is being measured.
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Exfoliation is a process in ______. A. chemical weathering. B. biological weathering. C. mechanical weathering. D. None of these.
The mechanical procedure of peeling is often referred to as exfoliation. Exfoliation is the term used to describe the process whereby rock sheets gradually separate from exposed rocks along fissures.
A description of mechanical weathering is given here:By using mechanical means, rocks and minerals are broken apart. Their chemical make-up does not alter. A big rock mass can be physically weathered into smaller, more easily moved, and more readily eroded pieces. Even enormous rocks frequently break along weak spots in nature. Exfoliation in metamorphic rocks, joints in huge igneous rocks, and bedding planes in sedimentary rocks are a few of the most typical.
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What is the total pressure that is exerted by the gases?
The total pressure exerted by gases is known as the total gas pressure or simply the pressure of the gas. It is the sum of the pressures exerted by each individual gas present in a mixture of gases.
The Total Pressure Exerted by The GasesThe total pressure exerted by a mixture of gases is the sum of the pressures exerted by each individual gas present in the mixture. This is due to the fact that each gas in a mixture will exert its own pressure independently of the other gases present.
The pressure exerted by a gas is directly proportional to the number of gas molecules present and the temperature of the gas. According to the kinetic theory of gases, the pressure of a gas is due to the constant random motion of its molecules, which collide with the walls of their container, exerting force on it.
The Ideal gas law which is PV = nRT relates the pressure of a gas to its volume, number of moles of gas present and the temperature of the gas. where P is the pressure, V is the volume, n is the number of moles of gas present, R is the gas constant and T is the temperature of the gas.
When we have a mixture of gases, the total pressure exerted by the gases is the sum of the pressures of each individual gas in the mixture. The total pressure of a gas mixture is often measured in units of atmospheres (atm) or pascals (Pa). This is known as the Dalton's Law of partial pressure.
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What does the object below model?
Answer:
A.Atoms in a molecule or electronic circuit
high gradation creates:____
In terms of gradation, transparency increases as the angle of a comb is raised. High gradations produce the most transparency.
What does the phrase "high grading" refer to?Professionals in the forestry industry refer to any type of harvesting technique that involves taking only the most expensive timber out of the woods and leaving the rest behind as "high-grading."
Describe a high grade cut.High grade refers to a harvest that leaves behind both tiny and large trees of low quality and species with low economic worth after removing those trees of commercial value. Any trees bigger than a certain diameter (for example, 12" and larger) are removed during a diameter-limit cut, which is a type of wood harvest. Cuts with a diameter restriction frequently have high grading.
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What is an indicator that a chemical change has occurred? a change in energy a change in shape the presence of solubility in water the presence of a melting point.
A chemical change has taken place an adjustment in energy.A chemical reaction can be detected by bubbling, a change in color, a change in smell, the production of a precipitate, and heat.
Which sign most strongly shows that a chemical shift is occurring?A change in color and the appearance of bubbles are two examples of chemical changes' symptoms. The five requirements for chemical change are: color change, precipitate or gas production, gas formation, odor change, and temperature change.Changes in color, temperature changes, the creation of gases, and the formation of solid precipitates are all indications that chemical reactions have taken place.A chemical reaction can be detected by bubbling, a change in color, a change in smell, the production of a precipitate, and heat.To learn more about chemical change refer to:
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the specific heat capacity of glass is 0.20 cal/(g°C). If 30 cal of heat is added to an unknown mass of glass, the temperature rises by 150°C. what is the mass of the glass?
The mass of the glass is 1 gram.
What is specific heat capacity?
This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
From the question:
cp= 0.20 cal/(g°C)
T = 150°C
heat added = 30 cal
Solution:To find the mass of the glass, you can use the formula:
mass = heat added / (specific heat capacity x temperature change)
Substituting the given values:
mass = 30 cal
(0.20 cal/(g°C) x 150°C)
mass = 30
(0.20 x 150)
mass = 30
30
mass = 1 g
Hence, the mass of the glass is 1 gram.
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SEP Plan an Investigation Suppose scientists have found three oxide materials that could potentially be used as a cathode to a magnesium or sodium anode in a battery for electronics. plan an investigation to determine the best battery. What characteristics would you test for?
The characteristics that would be tested for would majorly be the electrode potential of the cells.
What are the electrodes?
We can see that in a battery, we have to electrodes and these are the cathode and the anode. The anode is the electrode that current would enter into the cell through it while the cathode which the current would leave the cell.
Now, we know that the anode is positively charged and the cathode is negatively charged. The elements that would serve as the cathode and the anode would depend on the relative electrode potentials of the elements.
We know that sodium is more electropositive than magnesium as such the magnesium would be the cathode and the sodium would be the cathode of the cell. This is how the anode and the cathode can be determined in the cell.
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Copper has two naturally occurring isotopes.69.15 % of copper atoms are Cu-63 and have a mass of 62.93 AMU. The other 30.85 % of copper atoms are Cu-65 and have a mass of 64.93 AMU What is the atomic mass of copper?
The average atomic mass of copper can be calculated from the mass and percentage abundance of its isotopes. The average atomic mass of copper is 36.54 amu.
What are isotopes?Isotopes are atoms of same element with different mass number. Isotopes slightly differ in physical and chemical properties from each other.
The average atomic mass of an element is calculated with the formula given below:
average atomic mass = ∑ (% abundance /100) × isotopic mass.
mass of Cu-63 = 62.93 amu
% abundance = 69.15 %
mass of Cu-65 = 64.93 amu
% abundance = 30.85 %
Average atomic mass = (69.15 % /100 × 62.93 ) + (30.85 % /100 × 64.93)
= 63.54 amu.
Therefore, the average atomic mass of copper is 63.54 amu.
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Read the following chemical equation. Cl2 (g) K Br− → K Cl− Br2 (g)
What mot likely happen during thi reaction? (5 point)
Potaium loe an electron. Potaium gain an electron. Bromine loe an electron. Bromine gain an electron
In this given chemical equation of oxidation reaction , Bromine will lose an electron.
In the given chemical reaction we can observe that initially Bromine is in a negative state. Later on it undergoes oxidation reaction. In any oxidation reaction there is a loss of electrons. Similarly when the oxidation increases in the Bromine it loses its electron. Whereas in the potassium there is no evident change. It remains cation i.e. positive charge in the reaction.
Let’s understand this after observing this equation deeply: Cl2 (g) + K+Br- gives K+Cl- + Br2(g) - Here in the equation, 1- of Bromide turns 0 after the reaction, where 1+ of potassium is the same in both the reactant & product side.
Thus, from the above argument we can conclude that Bromine will lose an electron.
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How do you transcribe and then translate a sequence of DNA into proteins?
The core dogma of molecular biology is the process by which DNA is converted into RNA, which is then translated into proteins.
During transcription, an enzyme known as RNA polymerase binds to a particular DNA sequence known as the promoter and produces a complementary RNA strand utilizing the data in the DNA's coding strand.
After transcription, the RNA molecule is moved from the nucleus into the cytoplasm where ribosomes interpret it and "translate" the genetic information into a series of amino acids. A functioning protein will then be formed from this amino acid sequence.
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To transcribe and translate a sequence of DNA into proteins, the DNA first needs to be transcribed into messenger RNA (mRNA) and then translated into proteins using the genetic code.
The first step in translating a DNA sequence into proteins is to transcribe the DNA into mRNA. This process occurs in the nucleus of the cell and is carried out by enzymes called RNA polymerases. After the DNA is transcribed, the mRNA is then exported out of the nucleus and enters the cytoplasm.
In the cytoplasm, the mRNA is translated into proteins by ribosomes with the help of transfer RNAs (tRNAs). During this translation process, the mRNA codons are translated into amino acids using the genetic code.
This code is composed of three-letter codons that correspond to the 20 amino acids used to make proteins. The tRNAs bring the corresponding amino acids to the ribosomes, where the amino acids are joined together by peptide bonds to form proteins.
This process continues until the ribosome reaches a stop codon, at which point the protein is complete.
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Please help
How many moles of O2 are required to generate 12 moles SO2 gas? 2CuFeS2 + 502 → 2Cu + 2FeO + 4SO2 [ ? ] mol O₂ O2
Answer:30 moles of oxygen are required if 12 moles of are consumed.
Explanation:The given balanced equation is:
From this balanced equation, there is 2:5 mol ratio between and .
We are asked to calculate the moles of required to react with 12 moles of .
It's a mol to mol conversion and the set up for this would be as:
=
So, 30 moles of oxygen are required to react with 12 moles of .
What is the concentration of H₂(g), in parts per million, in a solution that contains 0.0001 g of H2(g) dissolved in 100. g of H₂O(l)?
Answer:
1 ppm :)
Explanation: i was guessing and 1 ppm was the answer :)
Draw the Lewis structure for the tellurium tetrabromide (TeBr_4)molecule.
Tellurium tetrabromide molecule have one tellurium atom and four Bromine atoms. The bonds are formed by electron sharing and so the bond between them are covalent bonds.
Tellurium tetrabromide is an inorganic compound. Tellurium have 6 valence electrons in its outer shell. Four of these valence electrons bonds to four bromine atoms, which has 7 valence electrons. A single bond is formed between each bromine and tellurium. Tellurium has a remaining lone pair of electrons.
Lewis structure of molecules means the simplest way of depicting all the atoms in a molecule, valence electrons of all molecules and the bonds that are formed. The binds are denoted by lines and electrons by dots.
Tellurium tetrabromide have one tellurium atom covalently bonded to four bromine atoms.
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(for a important test!! and use in your own words!!)
In one or two sentences, describe the connection between evaporation and a rainy climate.
Describe the relationship between evaporation and a rainy climate in one or two sentences.
How does evaporation explain itself?A liquid transforms into a gas during evaporation. It is easy to visualize when raindrops "vanish" from puddles on a hot day or when wet clothing dries in the heat. Instead of really dissipating in these situations, the liquid water is evaporating into a gas known as water vapor. Global evaporation takes place.
Why is it called evaporation?Evaporation occurs on surfaces. Because it happens when molecules with more kinetic energy from the top layer of the liquid escape into the air, evaporation is a surface phenomenon.
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how should non-azeotropic refrigerant blends be charged
Every non-azeotropic refrigerant ought to be charged as a liquid. Containers for storing refrigerant that are reusable and have a pressure limit of 15 psig
A non-azeotropic refrigerant is defined as what?With regard to compressor power and coefficient of performance, a non-azeotropic refrigerant combination is offered for use in heat pumps. This mixture is more efficient than currently available refrigerants or their blends.
How do azeotropic and zeotropic differ from one another?The same proportion of the fluid and vapour phases characterizes an azeotropic mixture of chemicals. A mixture of two liquids is essentially what it is. The boiling temperatures of a zeotropic mixture are essentially constant or the same, and the liquid and vapour of the combination have the same chemical make-up.
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How do you transcribe and translate amino acids?
To transcribe and translate amino acids, they must first be transcribed from DNA to mRNA, then translated from mRNA to protein.
Transcribing involves the use of an enzyme called RNA polymerase, which reads the DNA sequence and synthesizes a complementary mRNA molecule.
The mRNA molecule is then read by ribosomes, which are responsible for translating the sequence into a sequence of amino acids. This process is called translation, and the resulting sequence of amino acids forms a protein.
The order of the amino acids determines the structure and function of the protein. Transcribing and translating proteins is important for the cell to make proteins that help it to survive and grow.
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How did the philosopher's stone affect alchemy?
Alchemists thought the philosopher's stone had the power to change base metals like lead into precious metals like gold or silver and could be utilized as an elixir of life to extend life.
What is a metal?Any of a wide range of opaque, fusible, ductile, & usually glossy substances, especially, one that is a chemical substance as opposed to an alloy. These substances are good conductors of heat and electricity create cations by the losses of electrons, or produce basic oxides and hydroxides.
How is metal made?Mass metal making, sheet metal formation, & sheet-bulk metal forming are the three different types of metal forming techniques. Forging, rolling, deep drawing, extrusion, wire drawing, & bending are just few common methods of metal formation.
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The concentration of a potassium manganate(VII) solution (KMnO4) is 10 g /l . What is the concentration of this solution in molarity?
Answer: 0.06 M
Explanation:
The definition of molarity is:
Molarity (M) = moles (mol) /liters (l)
Step 1: Convert grams of KMnO₄ to moles of KMnO₄.
10 g KMnO₄ x (1 mol KMnO₄/158.03 g KMnO₄) = 0.06328 mol KMnO₄
Step 2: Place the values of moles and liter into the definition of molarity.
M = mol/L
M = 0.06328 mol/1 L
Divide 0.06328 by 1
M = 0.06328
M = 0.06 to correct number of significant figures
explain how the process of measuring a liquid's volume differs from the process of measuring a solid's volume
As the forces of attraction are greater in solids than in liquids , volume of liquids is determined by graduated cylinder while that of solid is obtained by multiplying it's dimensions.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which of these changes is
an example of a chemical
change?
A. cutting a loaf of bread
B. silver tarnishing to form silver oxide
C. mixing nuts, raisins, and candies to
make trail mix
D. knitting a blanket from yarn
knitting a blanket from yarn, burning, cooking, rusting and rotting are examples of chemical changes.
Which of the changes are chemical changes?Burning, frying, rusting, and rotting are a few instances of chemical transformations. The physical transformations of boiling, melting, freezing, and shredding are a few examples. Single replacements, double replacements, synthesis, breakdown, and oxidation are the five categories of chemical transformations. Chemical reactions are another name for a chemical transformation. Chemical changes play a significant role in our lives. Chemical changes result in the formation of all new compounds. For instance, a sequence of chemical changes cause the digestion of food in our bodies, fruit ripening, grape fermentation, etc. Combination, decomposition, single-replacement, double-replacement, and combustion are the five fundamental types of chemical reactions.To learn more about chemical changes refer to:
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draw the lewis structure of sf4 showing all lone pairs
The Lewis structure of SF4 consists of one sulfur (S) atom and four fluorine (F) atoms.
Sulphur (S) is in the center and the fluorine (F) atoms are circled .
The Lewis structure of SF4 contains 13 lone pairs and 4 bonding pairs.
Note that in the Lewis structure, the lone pairs are represented by dots and the bonding pairs are simply, double or triple.
So there are 4 bonding pairs in the Lewis structure of SF4, which means there are 8 bonding electrons and 13 lone pairs (1 on the central atom + 3 on each fluoride atom).
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A cancer patient needs to increase his ascorbic acid (C6 H8 O6) intake to fight cancer cells.
A) How many moles of ascorbic acid does he need to complete the doctor's prescription of 13.00g of intravenous ascorbic acid everyday for one mol.
B) How many molecules of ascorbic acid does he need everyday to fight the cancer?
C) Aspartame (C14 H18 N2 O5) is a synthetic table sugar substitute used in food & drinks. If a food product needs 0.25g of C14 H18 N2 O5, to sweeten the 2 vennie cupcake, and you ate this product, how many molecules of aspartame have you eaten?
0.073 moles of ascorbic acid are needed to complete the prescription.0.4445×10²³ molecules are required .0.0014 molecules of aspartame are eaten.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.
For 1st part, as 1 mole=176.14 g , thus, 13 g=13×1/176.14=0.073 moles, for 2 nd part, as 1 mole=6.023×10²³ molecules, 0.073 moles=0.073×6.023×10²³=0.4445×10²³ molecules, for 3 rd part, 1 molecule=176.14 g , thus 0.25 g = 0.25/176.14=0.0014 molecules.
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The SI units for measuring the acceleration of the car:
Answer:
Accelerometer
Explanation:
Accelerometer are use to measure Acceleration
Given the following equation:
2 AgNO3 + CaCl2 --> 2 AgCl(s) + Ca(NO3)2
What is the net ionic equation:
A. Ca2+ + 2 Cl- --> CaCl2
B. Ag+ + NO3- --> AgNO3
C. Ca2+ + 2 NO3- --> Ca(NO3)2
D. Ag+ + Cl- --> AgCl
The net ionic equation is: D. Ag+ + Cl- --> AgCl
What is the chemical formula for the product formed from CaCl2 ?The chemical formula for the product formed from CaCl2 in the equation 2 AgNO3 + CaCl2 --> 2 AgCl(s) + Ca(NO3)2 is Ca(NO3)2. This is a compound that consists of one calcium ion (Ca2+) and two nitrate ions (NO3-). It is a salt of calcium and nitric acid. It is a white crystalline solid that is highly soluble in water and is commonly used as a fertiliser. It is also sometimes used in the laboratory as a source of calcium ions in experiments. Overall, it is a product formed by the combination of two substances: calcium chloride and nitric acid.
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Enter the electron configuration for Ne. Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons
1s 2s 2p 3s 3p 3d 4s 4p 4d 4f
5s 5p 5d 5f 6s 6p 6d 7s 7p 7d
Electron configuration for Ne is [tex]$1 s^2 2 s^2 2 p^6$[/tex].
What is electronic configuration?The arrangement of an element's atoms and electrons among various atomic orbitals is symbolically represented by the electronic configuration of that element.
In the electronic configuration, electrons are dispersed throughout an atom's several energy levels, or "shells," including the K shell, L shell, M shell, and N shell, among others.
All electron-containing atomic subshells are placed in a particular order according to the conventional nomenclature for atomic electron configurations.
Protons, neutrons, and electrons are the three main subatomic particles found in an atom.
With a total of 10 electrons, neon is the tenth element. The initial two electrons in the electron configuration for neon will be in the 1s orbital. The following two electrons for Ne enter the 2s orbital since 1s can only hold two electrons. Six additional electrons will enter the 2p orbital.
Therefore the Ne electron configuration will be
[tex]$1 s^2 2 s^2 2 p^6$[/tex]
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What is the mass in grams of 6.022 1023 atoms of 12C?
The mass of 6.022 1023 atoms of 12C is equal to 12 grams.
This is because 12C has an atomic mass of 12, meaning that each atom of 12C has a mass of 12 grams.
This means that 6.022 1023 atoms of 12C would have a total mass of 12 grams.
According to the Avogadro's constant, 6.022 x 1023 atoms of 12C would have a mass of 12 x 6.022 x 1023 grams, which is equal to 72.264 x 1023 grams.
Avogadro's Constant is an important physical constant which states that the same number of particles (atoms, molecules, ions, etc.) have the same mass in a given sample regardless of the nature of the particles.
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Record the mass show on each balance. Remember to include both the value on the beams and the unit of measurement.
A tick marks between both the boldface values on this beam denote tenths of grams, while the bolded text numbers in this beam are in grams.Simply sum the figures from of the three beams to determine the object's mass that is resting on the pan.
By utilizing a beam balance, how can one determine an object's mass?To keep a beam horizontal for just a beam balance, a body with gravitational mass m1 and a standard weight pf m2 are placed in the left and right pans, respectively. If a1 = a2, then m1 = m2, and vice versa.
Can you two configurations weight disparate things on the beam?Yes, it is possible to achieve equilibrium between the two masses by bringing the midway (balancing point) closer to a heavier object or closer to the center of gravity.
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What mass of oxygen contains the same number of oxygen atoms as nitrogen atoms present in 28.02 g of nitrogen?
As there are [tex]$2.32 \times 10^{-23} \mathrm{~g}$[/tex] nitrogen atoms in 28.02 g of nitrogen, there are the same number of oxygen atoms in the mass of oxygen.
What mass of oxygen contains the same number of molecules?Nitrogen atomic mass [tex]$=14 \mathrm{~g} / \mathrm{mole}$[/tex]
e.g., mass of one mole of [tex]$\mathrm{N}=14 \mathrm{~g}$[/tex]
Contains in 1 mole [tex]$6.022 \times 10^{23}$[/tex] atoms
[tex]$\therefore$[/tex] mass of [tex]$6.022 \times 10^{23}$[/tex] atoms of [tex]$\mathrm{N}=14 \mathrm{~g}$[/tex]
one atom's mass [tex]$\mathrm{N}=\frac{14 \mathrm{~g}}{6.022 \times 10^{23} \text { atoms }}$[/tex]
One N atom has a mass of [tex]$2.32 \times 10^{-23} \mathrm{~g}$[/tex]
Mole of Molecules: One mole is equal to [tex]6.022 \times10^{23}[/tex] molecules, or the molecular mass of one gram of any given substance. As a result, 1 mole of oxygen weighs 32 grams and has [tex]6.022 \times10^{23}[/tex] molecules in it. A mole of water weighs 18 grams and has [tex]6.022 \times10^{23}[/tex] molecules in it.
In 28 g of nitrogen, there are 2 moles. In order to find the number of molecules in one mole of oxygen, we will multiply 9.03 times 10 to the 23 molecules of oxygen, then by the molar mass of oxygen, which is 32.00 g of oxygen. This will give us 48.0 g of oxygen, which has the same number of molecules as one mole. As 42 g
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Given the following equation: 2 KCIO3 → 2 KCl +30₂
2. How many moles of O₂ can be produced by letting 9 moles of KCIO3 react?
The balanced equation tells us that we get 3 moles of O2 for every 9 moles of KClO3.we'll get (9/2)*3(m.0) moles O2 or 13.5 moles of O2.
How to calculate moles in a chemical reaction?
A mole is the mass of a substance made up of the same number of fundamental components. Atoms in a 12 gram example are identical to 12C. Depending on the substance, the fundamental units may be molecules, atoms, or formula units.
A mole fraction shows how many chemical elements are present. The value of 6.023 x 1023 is equal to one mole of any substance (Avagadro number). It can be used to quantify the chemical reaction's by-products. The symbol for the unit is mol.
The number of moles formula is denoted by the following expression.
Mass of material / Mass of one mole equals the number of moles.
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