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Question

Using the data provided, calculate the multiple bond energy (kJ mol1) of a CC bond in C2H2. Given that the heat of formation of C2H2=225 kJ mol1. (take the bond energy of CH bond as 350 kJ mol1 ):
2C(s)2C(g) H=1410 kJ mol1
H2(g)2H(g) H=330 kJ mol1

A
1165
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B
837
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C
865
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D
815
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Solution

The correct option is D 815
(i) 2C(s)+H2(g)HCCH(g) Hf=225 kJ mol1
(ii) 2C(s)2C(g) H=1410 kJ mol1
(iii) H2(g)2H(g) H=330 kJ mol1
From equation (i):
ΔHf=[ΔHsub+ΔH ][2×BECH+1×eCC]
225=[1410+1×330][2×350+1×BECC]
225=[1410+330][700BECC]
225=1740700BECC
BECC=1040225=815 kJ mol1
BECC=815 kJ mol1

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