the Mole and Mole Calculations Quiz

What is the value of Avogadro’s number?

• 6.02 × 10^{20}

• 6.02 × 10^{23}

• 1.00 × 10^{6}

• 3.00 × 10^{8}

Which unit is used to express the amount of substance in chemistry?

• Liter

• Mole

• Gram

• Meter

What is the molar mass of water (H_2O)?

• 10 g/mol

• 16 g/mol

• 18 g/mol

• 20 g/mol

Which of the following best defines a mole in chemistry?

• The mass of a substance

• The number of particles equal to Avogadro’s number

• The volume of a gas

• The density of a substance

What is the molar mass of sodium chloride (NaCl)?

• 23 g/mol

• 35.5 g/mol

• 58.5 g/mol

• 18 g/mol

How many grams are in 0.5 moles of NaCl? (Molar mass of NaCl = 58.5 g/mol)

• 29.25 g

• 58.5 g

• 117 g

• 0.5 g

How many molecules are in 2 moles of CO_2?

• 1.20 × 10^{24}

• 6.02 × 10^{23}

• 3.01 × 10^{23}

• 2.00 × 10^{23}

How many atoms are in 0.25 moles of magnesium (Mg)?

• 1.51 × 10^{23}

• 6.02 × 10^{23}

• 2.41 × 10^{23}

• 3.01 × 10^{23}

What is the molar mass of CaCO_3? (Atomic masses: Ca = 40, C = 12, O = 16)

• 56 g/mol

• 100 g/mol

• 40 g/mol

• 60 g/mol

Which of the following has the greatest number of molecules?

• 1 mole of H_2O

• 1 mole of CO_2

• 1 mole of O_2

• All have the same number of molecules