An 0.727 mol sample of argon gas at a temperature of 22.0 °C is found to occupy a volume of 26.2 liters. The pressure of this gas sample is how many mm Hg?

Answer 1

Use PV = nRT and solve for P (in atmospheres) and convert to mm Hg.
1 atm = 760 mm Hg. Don't forget T must be in kelvin.