Chemistry

Chemistry

Problem

Using the data (all values in kcal

\text{mol}^{-1}

at 25°C) given below, calculate bond energy of C—C and C—H bonds.

C(s) $\longrightarrow$ C(g);	$\Delta H = 172$
H $_2$ $\longrightarrow$ 2H;	$\Delta H = 104$
H $_2$ + $\frac{1}{2}$ O $_2$ $\longrightarrow$ H $_2$ O(l);	$\Delta H = -68.0$
C(s) + O $_2$ $\longrightarrow$ CO $_2$ ;	$\Delta H = -94.0$

Heat of combustion of

\text{C}_2\text{H}_6 = -372.0

Heat of combustion of

\text{C}_3\text{H}_8 = -530.0

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