The C - C bond energy from the following data will be
(i) `C(s)rarr C(g), Delta H=170.9` kcal
(ii) `(1)/(2)H_(2)(g)rarr H(g), Delta H=52.1` kcal
(iii) Heat of formation of ethane `= -20.3` kcal
(iv) C - H bond energy = 99.0 kcal

Options

A. 80.7 kcal
B. 40.9 kcal
C. 88.3 kcal
D. 26.8 kcal

Explanation

To find the C-C bond energy using the given data, we can apply Hess's law, which states that the total enthalpy change during a chemical reaction is the sum of the enthalpy changes for the individual steps of the reaction.

### Step-by-Step Solution:

1. **Write the Reaction for the Formation of Ethane:**
The formation of ethane (C2H6) from its elements in their standard states can be represented as:
\[
2C(s) + 3H_2(g) \rightarrow C_2H_6(g)
...