Which of the following is true of a sample of hydrogen gas whose mass is 4.00g under a pressure or 2atm and a temperature of 27°C? (H = 1, R = 0.082 lit atm. mol^-1 deg^-1)

• A.its volume is 24.6 litres
• B.it contains 6.02 x 10²³ molecules
• C.it exists as atoms because of temperature
• D.none of the above