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Question

Enthalpy of combustion of carbon to CO2 is -393.5 kJ mol1. Calculate the heat released upon formation of 35.2g of CO2 from carbon and dioxygen gas.

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Solution

The balanced chemical reaction for the combustion of C to CO2 is given below:
C(s)+O2(g)CO2(g); ΔH=393.5kJ/mol
The formation of 44g(1 mol) of CO2 releases 393.5 kJ of heat.
The formation of 35.2 g of CO2 releases 393.5×35.244=314.8kJ of heat.

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