1. Molar Volume
Chapter 7-2

2. STP
The volume of a gas varies with a change in temperature or/and a change in pressure.
The volume of a gas is usually measured at a Standard Temperature and Pressure (STP).
Standard Temp = 0 0C
273 K
Standard Pressure = 1 atm
101.3 kPa
760 Torr

3. Molar Volume
At STP, 1 mol of any gas occupies a volume of 22.4 L. This is known as molar volume of a gas.
At STP 1 mol = 22.4 L

4. Sample Problem
Determine the volume, in liters, of mol SO2 gas at STP.

5. Sample Problem
Determine the volume of 2.56 x molecules of nitrogen gas at STP.

6. Sample Problem
Calculate the mass, in grams, of 3.56 Liters of chlorine gas at STP