# Moles and gas volumes

HideShow resource information
• Created by: racheon
• Created on: 22-02-14 19:09
Define molar volume.
The volume per mole of a gas. The units of it are dm^3 mol^-1. At room temperature and pressure it's approximately 24 dm^3 mol^-1.
1 of 12
What do equal volumes of gases at the same temperature and pressure contain?
Equal numbers of molecules, it doesn't matter which type of gas is being measured.
2 of 12
By measuring the volume of any gas what are you indirectly counting?
The number of molecules.
3 of 12
At room temperature and pressure how much does 1 mole of gas molecules occupy?
24 dm^3 or 24 dm^3 mol-1 volume.
4 of 12
At room temperature and pressure what is 1 mole of H2, O2 and CO2 molar volume?
24 dm^3 mol^-1.
5 of 12
What does 1 mol of H2 weigh?
2g.
6 of 12
What does 1 mole of O2 weigh?
32g.
7 of 12
What does 1 mole of CO2 weigh?
44g.
8 of 12
If volume is in dm^3 how do you work out how many moles there are?
n=V/24.
9 of 12
If volume is in cm^3 how do you work out how many moles there are?
n=V/24,000.
10 of 12
What amount, in mol, of gas molecules is in 72cm^3 of any gas at room temperature and pressure?
n=V/24,000=72/24,000=0.003 mol.
11 of 12
What is the volume, in cm^3, of 2.13x10^-3 mole of a gas at room temperature and pressure.
n=V/24,000. Hence, V=nx24,000=2.13x10^-3x24,000=51.12cm^3.
12 of 12

## Other cards in this set

### Card 2

#### Front

What do equal volumes of gases at the same temperature and pressure contain?

#### Back

Equal numbers of molecules, it doesn't matter which type of gas is being measured.

### Card 3

#### Front

By measuring the volume of any gas what are you indirectly counting?

### Card 4

#### Front

At room temperature and pressure how much does 1 mole of gas molecules occupy?

### Card 5

#### Front

At room temperature and pressure what is 1 mole of H2, O2 and CO2 molar volume?