Chemistry 11 BC Curriculum Test: Molar Mass, Molar Volume, and More
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Questions and Answers

What is the formula to calculate molar mass of a compound?

  • Divide the atomic mass by the number of atoms in the compound
  • Sum of atomic masses of all atoms in the compound (correct)
  • Atomic mass of the most abundant atom in the compound
  • Double the atomic mass of the compound

Which unit is used to express molar volume?

  • Liters per mole (correct)
  • Liters per gram
  • Moles per liter
  • Moles per gram

What is the relationship between density and molar mass?

  • Directly proportional (correct)
  • No relationship
  • Inversely proportional
  • Density depends only on temperature

How is Avogadro's number defined?

<p>6.022 x 10^23 molecules per mole (C)</p> Signup and view all the answers

What does percent composition indicate in a chemical compound?

<p>Percentage of each element's mass in the compound's total mass (C)</p> Signup and view all the answers

What is the formula to calculate molar volume?

<p>$V = \frac{n}{M}$ (D)</p> Signup and view all the answers

Which factor is not considered when calculating the molar mass of a compound?

<p>Atomic number of the elements (D)</p> Signup and view all the answers

How does Avogadro's number relate to molar volume?

<p>Determines the number of particles in one mole of a substance (B)</p> Signup and view all the answers

In percent composition, what does the percentage represent?

<p>Mass percentage contribution of each element in the compound (B)</p> Signup and view all the answers

Which factor is crucial in determining the empirical formula of a compound?

<p>Ratio of atoms in the compound (B)</p> Signup and view all the answers

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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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.

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