The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is
Given,
C(s)+O2( g)⟶CO2( g),ΔH=-393.5 kJ/mol
Amount of heat released on formation of 44 gCO2=393.5 kJ
∴ Amount of heat released on formation of 35.2 gCO2
=-393.544×35.2
=-314.8≈-315 kJ