C4.9 - Volumes Of Gases (Finished)

Question 1

How much volume will one mole of gas take up at room temp and pressure?

Answer 1

One mole of any gas will occupy 24 dm3, the same volume

Question 2

What is room temperature and pressure?

Answer 2

Temp = 20 °C
Pressure = 1 atmosphere

Question 3

How do you find the volume of a gas at room temp and pressure?

Answer 3

Volume of gas = (mass of gas / Mr of gas) * 24

Question 4

What is the molar gas volume?

Answer 4

24 dm3 / mole

Question 5

How do you calculate the number of moles of a gas? (At room temp and pressure)

Answer 5

No of moles of gas = volume of gas (dm3) / 24 dm3

Question 6

How do you find out the volume of products / reactants (gases) in gas reactions? (When given a known volume of one reactant/product)

Answer 6

1) The ratio of the reactants and products in the balanced equation gives you the ratio of volumes of gases involved
2) You know the volume of one gas so you use the ratio to figure out the volume of the other e.g. 2 O2 makes 1 Co2 so 30dm3 o2 15dm3 co2