A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is : (R = 8.3 J mol–1 K–1)

0.1 kg/m3 0.02 kg/m3 0.5 kg/m3 0.2 kg/m3

0.2 kg/m3

PM = \(\rho\) RT P = 249 kPa ; M = 2 g ; T = 300 K  \(\rho\) = 0.2 kg/m3