A cylinder of capacity 20 litres is filled with H2 gas. The total average kinetic energy of translatory motion of its molecules is 1.5 x 105 J. The pressure of hydrogen in the cylinder is
(a) 2 x 106 N/m2
(b) 3 x 106 N/m2
(c) 4 x 106 N/m2
(d) 5 x 106 N/m2
