Question

For the real gases reaction 2CO (g) + O₂ (g) → 2CO₂ (g) ; 

ΔH = – 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 :

(1) – 557 kJ 

(2) – 530 kJ

(3) – 563 kJ 

(4) None of these

Answer 1

Correct Answer is: (2) – 530 kJ

At constant volume ΔH= ΔU+VΔP

⇒ – 560 = ΔU + 10 × (–30) × 0.1

⇒ ΔU = –530 kJ