Question

Two moles of helium gas are taken over the cycle ABCDA, as shown in the P-T diagram.
Assume the gas to be ideal the magnitude of work done on the gas in taking it form A to B is:

• A. 200 R
• B. 300 R
• C. 400 R
• D. 500 R

Answer 1

The correct option is C 400 R

Given : $T_A=300K$ $T_B=500K$ $n=2$

Work done $W_{AB}=nR\Delta T$ (isobaric process)

Or $W_{AB}=2R(500-300)=400R$