1.

Given (at 25^(@)C): C (s, graphite)toC(g),DeltaH^(0)=+713.64kJmol^(-1) (1)/(2)H_(2)(g)toH(g),DeltaH^(0)=+218kJ*mol^(-1) 6C(s, graphite)+3H_(2)(g)toC_(6)H_(6)(g),DeltaH^(0)=+82.93kJ*mol^(-1) At 25^(@)C, if the energy of C_H and C-C bonds are 418 and 347 kJ*mol^(-1) respectively, then the C=C bond energy is-

Answer»

`+679.8kJ*MOL^(-1)`
`+652.63kJ*mol^(-1)`
`+808.75kJ*mol^(-1)`
`+763.39kJ*mol^(-1)`

ANSWER :B


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