Moles of N2 problem

Question

An 11.2 L sample of gas is determined to contain 0.50 mole of N2. At the same temperature and pressure, how many moles of gas would there be in a 20. L sample?

Answer 1

At the same temperature and pressure, moles of gas is proportional to volume.

11.2 L/0.50 moles = 20. L/x moles

x = 0.89 moles