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Question

Using the data provided, calculate the multiple bond energy (kJmol1) of a CC bond in C2H2. Given that the heat of formation of C2H2 is 225kJmol1 (take the bond energy of a CH bond as 350kJmol1)
2C(s)2C(g);ΔH=1410kJmol1
H2(g)2H(g);ΔH=330kJmol1

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
The heat of formation of C2H2 is 225kJmol1 (take the bond energy of a CH bond as 350kJmol1) :
(i) 2C(s)+H2(g)HCH(g);ΔH=225kJmol1
(ii) 2C(s)2C(g);ΔH=1410kJmol1
(iii) H2(g)2H(g);ΔH=330kJmol1
From equation (i) :
225=[2×ΔC(s)C(g)+1×eHH][2×eCH+1×eCC]
225=[1410+1×330][2×350+1×eCC]
225=[1410+330][700+eCC]
225=1740700eCC
eCC=1040225=815kJmol1
BECC=815kJmol1
The multiple bond energy (kJmol1) of a CC bond in C2H2 is 815kJmol1.

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