1.0 kmol of air is heated from 20 deg.C to 50 deg.C in a closed cylinder. Treating air
as an Ideal Gas with constant specific heats, the change in enthalpy H will be:
(A) ...873.1 kJ
(B) ..623.8 kJ
(C) ....21.5 kJ
(D) ....30.15 kJ