The heats of combustion of carbon and carbon monoxide are -393.5 and , respectively. The heat of formation (in kJ ) of carbon monoxide per mole is :
- (A)676.5
- (B)-676.5
- (C)-110.5✓ Correct
- (D)110.5
Answer: (C)
Solution
By Hess's law, build by burning carbon fully and subtracting the combustion of CO. With at kJ and at kJ, the heat of formation of CO is kJ per mole, an exothermic value close to kJ.
JEE Main · 2016 · 03 Apr 2016 · Offline · Single correct option