22.4 L of a gas at a temperature of 0°C are at a pressure of 2.0 atm. How many moles of gas are contained in the sample?

0.5 mol

1.0 mol

2.0 mol

3.0 mol

2 mol. When using pv=nrt, all conditions mentioned are standard except for pressure. Because the pressure is double, the mols also has to double from standard conditions. Therefore, instead of the standard 1 mol, it would be 2 mol.