Volume Occupied By Gases

Gases will expand or contract depending on the different temperatures and pressure therefore changing the volume of these cases
The standard condition of temperature and pressure is STP and we can use this condition to compare the different volumes of gases
STP = 1 atmosphere of pressure and a temperature of 0 degrees Celcius
At STP, 1 mole of a gas will have a volume of 22.4 Litres


The unit conversion can then be formed as:

22.4 L of Gas/ 1 mole of Gas or 1 mole of Gas/22.4 L of Gas

Examples:

Calculate the amount of volume occupied by  2.5 moles of CO2 at STP.

2.5 moles CO2 x 22.4 L of Gas = 56 L

Calculate the amound of of volume occupied by 36.0g of NH3.

N= 14.0g H= 1.0g

36g NH3/17.0g = 2.12 moles NH3

2.12 moles NH3 x 22.4L = 47.4 L

Remember to count the amount of significant figures when rounding your final answer~!

This video includes some examples as well as higher level questions relating to the concept of volume of gases per mole.