First slide

Hess law of constant summation

Question

1) C_Graphite + O_2(g) →CO_2(g);ΔH = -94 K.Cals
2) C_Diamond + O_2(g) → CO_2(g);ΔH = -94.5 K.Cals
From the above data the heat of transition of C_diamond → C_Graphite

Easy

Solution

1) C_Graphite + O_2(g) →CO_2(g);ΔH₁ = -94 K.Cals
2) C_Diamond + O_2(g) → CO_2(g);ΔH₂ = -94.5 K.Cals
Substract equation (1) from eqation(2)
$\begin{array}{l} \Delta {H_{transition}} = \Delta {H_2} - \Delta {H_1}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \, - 94.5 - ( - 94)\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \, - 0.5K.cal = - 500cal \end{array}$

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