Standard molar heat enthalpy for converting carbon from graphite and diamond form into vapour state directly are 725 and 713 kJ respectively. The standard enthalpy change for polymorphism of 1 g carbon $C_{G \to D}$ is _____ .

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Solution

Standard molar heat enthalpy for converting carbon from graphite and diamond form into vapour state directly are 725 and 713 kJ respectively.
The standard enthalpy change for polymorphism of 1 mole of carbon $C_{G \to D}$ is $725 k J - 713 k J = 12 k J$
The standard enthalpy change for polymorphism of 1 g carbon $C_{G \to D}$ is $\frac{12 k J}{12 g} = 1 k J$ .

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