The heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
Enthalpy of formation of a substance is the heat required to form 1 mole of a substance from its reactants.
Carbon reacts with oxygen to produce carbon dioxide.
The enthalpy of formation of carbon dioxide is -393.5 kJ/mol.
Therefore, the heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
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