Question

Solve problem:

What is volume of carbon dioxide, CO₂ occupying by 0.5 moles of CO₂ gas measured at STP?

Answer 1

Given: Number of moles of CO₂ = 0.5 mol

To find: Volume at STP

Formula: Number of moles of a gas (n) = `"Volume of a gas at STP"/"Molar volume of a gas"`

Calculation: Molar volume of a gas = 22.4 dm³ mol^–1 at STP.

Number of moles of a gas (n) = `"Volume of a gas at STP"/"Molar volume of a gas"`

∴ Volume of the gas at STP = Number of moles of a gas (n) × Molar volume of a gas
= 0.5 mol × 22.4 dm³ mol^–1
= 11.2 dm³

Volume of 0.5 mol of CO₂ = 11.2 dm³