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Asked by g_archanasharma | 20 Feb, 2019, 06:04: PM

Expert Answer

The hydrogenation of cyclohexene:

space space straight C subscript 6 straight H subscript 10 left parenthesis straight g right parenthesis end subscript space space space plus space space straight H subscript 2 left parenthesis straight g right parenthesis end subscript space space space rightwards arrow with blank on top space space straight C subscript 6 straight H subscript 12 left parenthesis straight g right parenthesis end subscript cyclohexene space space space space space space space space space space space space space space space space space space space space cyclohexane

let's find out the ΔHHydrogenation =?

We have given,

(i)

straight H subscript 2 left parenthesis straight g right parenthesis end subscript space plus 1 half space straight O subscript 2 left parenthesis straight g right parenthesis end subscript space rightwards arrow with blank on top space straight H subscript 2 straight O subscript left parenthesis straight l right parenthesis end subscript space space space space space space space space space space space space space space.................... increment straight H degree space equals space minus 241 space kJ

(ii)

space space straight C subscript 6 straight H subscript 10 left parenthesis g right parenthesis end subscript space space space plus space 17 over 2 space O subscript 2 left parenthesis g right parenthesis end subscript space space space rightwards arrow with blank on top space space 6 CO subscript 2 left parenthesis straight g right parenthesis end subscript space space plus space 5 space straight H subscript 2 straight O.............................. space increment straight H degree equals negative 3800 space kJ

(iii)

space space straight C subscript 6 straight H subscript 12 left parenthesis g right parenthesis end subscript space space space plus space 9 O subscript 2 left parenthesis g right parenthesis end subscript space space space rightwards arrow with blank on top space space 6 CO subscript 2 left parenthesis straight g right parenthesis end subscript space space plus space 6 space straight H subscript 2 straight O.............................. space increment straight H degree equals negative 3920 space kJ

ΔH_{Hydrogenation} = (i) + (ii) - (iii)

ΔH° = -241 kJ + (-3800 kJ) - (-3920 kJ)

= - 121 kJ

Answered by Ramandeep | 21 Feb, 2019, 11:07: AM

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