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Question

The enthalpies of combustion at 25oC of H2, cyclohexane (C6H12) and cyclohexene (C6H10) are 241,3920 and 3800 kJ/mol respectively. The heat of hydrogenation of cyclohexene is:

A
121kJ/mol
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B
+121kJ/mol
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C
242kJ/mol
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D
+242kJ/mol
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Solution

The correct option is C 121kJ/mol
H2(g)+12O2(g)H2O(l);ΔH=241kJ...(i)
C6H10+172O2(g)6CO2(g)+5H2O(l);ΔH=3800kJ..(ii)
C6H12+9O2(g)6CO2(g)+6H2O(l);ΔH=3920kJ...(iii)
eq.(i)+eq.(ii)eq.(iii)
ΔH=2423800(3920)=121kJ

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