1.

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

Answer»

80.7 KCAL
40.9 kcal
88.3 kcal
26.8 kcal

SOLUTION :`2C(s)+3H_(2)(g)RARR C_(2)H_(6)(g), Delta H=-20.3 kcal`
Also, `Delta H = -[1 BE_(C-C)+6BE_(C-H)]+[2{C(s)rarr C(g)}+3BF_(H-H)]`
`-20.3=-[BE_(C-C)+6xx99]+[2xx170.9+3xx(2xx52.1)]`
`therefore BE_(C-C)=-594+341.8+312.6+20.3`
C - C bond energy = 80.7 kcal


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