Molar Volume Calculation - 1

The molar volume is the volume occupied by one mole of any gas. At room temperature and pressure (r.t.p., 293 K (20°C) and 101 kPa) it is 24.0 dm³ mol^-1. It does not matter which gas it is: one mole of hydrogen and one mole of carbon dioxide take up the same volume at the same temperature and pressure.This gives two linked equations:volume of gas (dm³) = amount (mol) × 24.0amount (mol) = volume of gas (dm³) ÷ 24.0Gas volumes are often given in cm³. Since 1 dm³ = 1000 cm³, the molar volume is also 24 000 cm³ mol^-1, so a volume in cm³ is divided by 24 000.Worked example 1: what volume does 0.250 mol of carbon dioxide occupy at r.t.p.?volume = 0.250 × 24.0 = 6.00 dm³Worked example 2: what mass of oxygen is in 480 cm³ of the gas at r.t.p.?amount of O₂ = 480 ÷ 24 000 = 0.0200 molmass = amount × M_r = 0.0200 × 32.0 = 0.640 gAlways check the units of the volume before you divide, and give the answer to the same number of significant figures as the data.