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Questions and Answers
What is the formula to calculate molar mass of a compound?
Which unit is used to express molar volume?
What is the relationship between density and molar mass?
How is Avogadro's number defined?
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What does percent composition indicate in a chemical compound?
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What is the formula to calculate molar volume?
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Which factor is not considered when calculating the molar mass of a compound?
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How does Avogadro's number relate to molar volume?
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In percent composition, what does the percentage represent?
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Which factor is crucial in determining the empirical formula of a compound?
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Study Notes
Molar Mass
- Molar mass is the mass of one mole of a substance
- It is calculated by summing the atomic masses of all atoms in a molecule
- Units of molar mass are grams per mole (g/mol)
Molar Volume
- Molar volume is the volume of one mole of a gas
- At standard temperature and pressure (STP), the molar volume of a gas is 22.4 L/mol
- Molar volume is used to convert between moles of a gas and its volume
Density
- Density is the mass of a substance per unit volume
- Units of density are grams per milliliter (g/mL) or grams per cubic centimeter (g/cm³)
- Density is used to identify substances and to calculate volumes and masses
Avogadro's Number
- Avogadro's number is a constant that represents the number of particles in one mole of a substance
- Its value is 6.022 x 10²³ particles
- It is used to convert between moles and number of particles
Percent Composition
- Percent composition is the percentage of each element in a compound
- It is calculated by dividing the mass of each element by the molar mass of the compound and multiplying by 100
- Percent composition is used to identify the elements present in a compound and their relative amounts
Empirical Formula
- Empirical formula is the simplest whole-number ratio of atoms in a compound
- It is calculated by dividing the molecular formula by the greatest common divisor of the subscripts
- Empirical formula is used to represent the composition of a compound
Molecular Formula
- Molecular formula is a chemical formula that shows the actual number of atoms in a molecule
- It is calculated by multiplying the empirical formula by the smallest whole number that gives the actual number of atoms
- Molecular formula is used to represent the composition of a compound and to calculate its molar mass
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Description
Test your knowledge of key topics such as Molar Mass, Molar Volume, Density, Avogadro's Number, Percent Composition, Empirical Formula, and Molecular Formula from the Chemistry 11 curriculum of British Columbia.
