C5.1.7 - Gas calculations

Question 1

What is molar volume?

Answer 1

The volume occupied by one mole of a gas (24dm3 at room temperature and pressure)

Question 2

What is the equation relating the amount and volume of a substance in the gas state?

Answer 2

Volume in dm3 = amount in mol x 24 dm3/mol

Question 3

How do you measure the volume of a gas using an upside-down measuring cylinder?

Answer 3

• Fill the measuring cylinder with water and, while keeping its mouth underwater, turn it upside down
• Clamp the measuring cylinder securely
• Mix the reactants in a concise flask and attach a delivery tube
• Measure the volume of gas produced in the reaction by recording the end reading on the measuring cylinder