InterviewSolution
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InterviewSolution
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Calculate the C-C bond energy from the following data `:` (i) 2 C ( graphite )`+3H_(2)(g) rarr C_(2)H_(6)(g), DeltaH =- 84.67 kJ ` (ii) C ( graphite ) `rarr C(g), Delta H = 716 .7 kJ ` (iii) `H_(2)(g) rarr 2H(g), Delta H = 435.9 kJ` Assume the C-H bond energy as 416 kJ |
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Answer» Correct Answer - `329.77kJ` Let us calculate `DeltaH` for the reaction, `C_(2)H_(6)(g),i.e., H - underset(H) underset(|) overset(H) overset(|) (C)-underset(H) underset(|) overset(H) overset(|) (C) -H(g) rarr 2C(g) +6H(g)` ` 2 xx `Eqn. (ii) `+3 xx ` Eqn. (iii) -Eqn. (i) gives `Delta _(r)H= 2825.77 kJ` If x is the bond energy of C-C bond,then `x+ 6 B.E. ( C-H)= 2825.77` `x +6 ( 416) = 2825.77` or `x=329.77kJ` |
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