Question

Two moles of an ideal gas are undergone a cyclic process 1 – 2 – 3 – 1. If net heat exchange in the process is – 300 J, then work done by the gas in the process 2-3 is (R = 8.3J/mol K)

• A. – 5000 J
• B. 5000 J
• C. – 3000 J
• D. None of these

Answer 1

Answer: (D)

None of these

Answer 2

W_{1 ® 2} = nR DT = 2 × R × 300

= 600 R = 4980 J

W_{1 ® 2 ® 3 ® 1} = W_{1 – 2} + W_{2 ® 3}

DU + DW = DQ

0 + W₁₂ + W₂₃ = DQ

4980J + W₂₃ = – 300 J

W₂₃ = – 5280 J