Question

Enthalpy of combustion of carbon to CO₂ is –393.5 kJ mol^–1 . Calculate the heat released upon formation of 35.2 _g of CO₂ from carbon and dioxygen gas. 

Answer 1

Formation of CO₂ from carbon and dioxygen gas can be represented as: 

(1 mole = 44 _g) 

Heat released on formation of 44 g CO₂ = –393.5 kJ mol^–1 

Heat released on formation of 35.2 g CO₂ 

= –314.8 kJ mol^–1