Question

For the real gases reaction 2CO (g) + O2 (g) $\longrightarrow$ 2CO2 (g) ; DH = – 560 kJ. In 10 litre rigid vessel at 500 K, the initial pressure is 70 bar and after the reaction it becomes 40 bar. The change in internal energy is :

• A. – 557 kJ
• B. – 530 kJ
• C. – 563 kJ
• D. None of thes

Answer 1

Answer: (B)

– 530 kJ

Answer 2

At constant volume $\Delta$H = $\Delta$U + VDP

$\Rightarrow$ – 560 = $\Delta$U + 10 × (–30) × 0.1

$\Rightarrow \Delta$U = –530 kJ