Question

The heat liberated from the combustion of 0.5 g of carbon raised the temperature of 2000 g of water from 24°C to 26°C. The heat of combustion of carbon (per mole) is 

(a) −4 kcal 

(b) −8 kcal 

(c) −62 kcal 

(d) −96 kcal

Answer 1

Correct option is (d) −96 kcal

Amount of heat liberated by 0.05 g of C

∴ Heat of combustion = − 8 × 12

= − 96 kcal per mol