The bond enthalpy of C - C, C = C, H - H and C - H bonds are 350,600,400 and 410 kJ · mol-1 respectively. The enthalpy change for reaction
`C_(2)H_(4(g)) +H_(2(g)) rarr C_(2)H_(6(g))` is

Options

A. `-170 kJ cdot mol^(-1)`
B. `-17.0 kJ cdot mol^(-1)`
C. `-260 kJ cdot mol^(-1)`
D. `-2600 kJ cdot mol^(-1)`

Answer

A

Explanation

`H-overset(H) overset(|)C=overset(H)overset(|)C-H+H-H rarr H-underset(H) underset(|) overset(H)overset(|)C-underset(H) underset(|) overset(H)overset(|)C-underset(H) underset(|) overset(H)overset(|)C-H`