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