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Hess' Law

Calculate Δ...

Question

Calculate $Δ H$ for the conversion of graphite to diamond.(in kJ/mol)
as nearest integer

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Solution

Carbon occurs in two forms: graphite and diamond. The enthalpy of combustion of graphite is -393.5 kJ, and that of diamond is -395.4 kJ
$C (g r a p h i t e) + O_{2} (g) \to C O_{2} (g) H = - 393.5 k J$
$C (d i a m o n d) + O_{2} (g) \to C O_{2} (g) H = - 395.4 k J$
$C (g r a p h i t e) \to C (d i a m o n d) Δ H = + 1.9 k J$

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