Mole & the Molar Mass

A sample of oxygen gas has a volume of 48 dm³ at room temperature and pressure. Calculate the number of moles of oxygen gas.

• 2 mol

• 4 mol

• 6 mol

• 8 mol

If 36 dm³ of nitrogen gas is collected, how many moles of nitrogen gas does this represent?

• 1.0 mol

• 1.25 mol

• 1.5 mol

• 1.75 mol

Calculate the number of moles of hydrogen gas in a container with a volume of 12 dm³.

• 0.25 mol

• 0.5 mol

• 0.75 mol

• 1.0 mol

What is the mass of 3 moles of carbon dioxide (CO₂) if the molar mass of CO₂ is 44 g/mol?

• 0.068 g

• 14.7 g

• 15.0 g

• 132 g

A student has 5 moles of methane (CH₄). The molar mass of methane is 16 g/mol. What is the total mass of methane?

• 0.3125 g

• 3.2 g

• 32 g

• 80 g

Calculate the number of moles in 88 g of carbon dioxide (CO₂) (molar mass of CO₂ = 44 g/mol).

• 0.5 mol

• 1.0 mol

• 1.5 mol

• 2.0 mol

What is the mass of 0.5 moles of water (H₂O), given that the molar mass of H₂O is 18 g/mol?

• 0.5 g

• 2 g

• 9 g

• 36 g

If 24 dm³ of helium gas is collected, how many moles of helium are there?

• 0.5 mol

• 1 mol

• 1.5 mol

• 2 mol

Determine the number of moles in 50 g of sodium chloride (NaCl) if its molar mass is 58.5 g/mol.

• 0.086 mol

• 0.855 mol

• 1.17 mol

• 11.7 mol

A balloon contains 72 dm³ of argon gas. How many moles of argon does it contain?

• 1 mol

• 2 mol

• 3 mol

• 4 mol