Using the data (all values in kcal at 25°C) given below

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Using the data (all values in kcal mol−1\text{mol}^{-1} at 25°C) given below, calculate bond energy of C—C and C—H bonds.
C(s) ⟶\longrightarrow C(g);ΔH=172\Delta H = 172
H2_2 ⟶\longrightarrow 2H;ΔH=104\Delta H = 104
H2_2 + 12\frac{1}{2}O2_2 ⟶\longrightarrow H2_2O(l);ΔH=−68.0\Delta H = -68.0
C(s) + O2_2 ⟶\longrightarrow CO2_2;ΔH=−94.0\Delta H = -94.0
Heat of combustion of C2H6=−372.0\text{C}_2\text{H}_6 = -372.0 Heat of combustion of C3H8=−530.0\text{C}_3\text{H}_8 = -530.0

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