A cylinder contains hydrogen gas at pressure of 249 kPa and temperature ${27}^{\mathrm{O}}\mathrm{C}$. 
  Its density is : ($\mathrm{R}=8.3{\mathrm{Jmol}}^{-1}{\mathrm{K}}^{-1}$)

• A

  $0.2\mathrm{kg}/{\mathrm{m}}^3$

• B

  $0.1\mathrm{kg}/{\mathrm{m}}^3$

• C

  $0.02\mathrm{kg}/{\mathrm{m}}^3$

• D

  $0.5\mathrm{kg}/{\mathrm{m}}^3$