What is the volume (in centiliters) of a sample of CO2 that masses 5.5 * 10^-4g at STP?

Answer 1

First convert g of CO₂ to moles of CO₂

5.5 x 10^-4 g CO₂ x (1 mol CO₂ / 44.01 g CO₂) = 1.2 x 10^-5 mol CO₂

At STP, 1 mole of a gas occupies a volume of 22.4 L. Setup a proportion to calculate the volume in Liters.

1 mol = 22.4 L

1.2 x 10^-5 mol = ? L

? = (22.4 L x 1.2 x 10^-5) / 1 mol = 2.7 x 10^-4 L

1 L = 100 cL

2.7 x 10^-4 L x (100 cL / 1 L) = 2.7 x 10^-2 cL