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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. 

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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

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