Question

The gases listed are at standard temperature and pressure:
· 1 mol of CO2 gas
· 1 mol of N2 gas
· 2 mol of O2 gas

Which statement is correct?
The volume of 1 mol of CO2 is greater than that of 2 mol of O2 .
The volume of 1 mol of CO2 is greater than that of 1 mol of N2 .
The volumes of 2 mol of O2 and 1 mol of N2 gases are the same.
The volumes of 1 mol of CO2 and 1 mol of N2 gases are the same.

Answer 1

The volumes of equal numbers of moles of gases at the same T and P are equal (Avogadro's law / ideal gas law V = nRT/P). So 1 mol CO2 and 1 mol N2 have the same volume. (Statement 4 is correct.)