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Question

2C(s)+2O2(g)2CO2(g), ΔH=787 kJ

H2(g)+12O2(g)H2O(l), ΔH=286 kJ

C2H2(g)+52O2(g)2CO2(g)+H2O(l), ΔH=1310 kJ

From the above data, heat of formation of acetylene is:

A
+1802 kJ
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B
1802 kJ
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C
800 kJ
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D
+237 kJ
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Solution

The correct option is D +237 kJ
The thermochemical reactions are as given below.

2C(s)+2O2(g)2CO2(g)ΔH=787 kJ

H2(g)+12O2(g)H2O(l)ΔH=286 kJ

C2H2(g)+52O2(g)2CO2(g)+H2O(l)ΔH=1310 kJ

The reaction (3) is reversed and added to reactions (1) and (2) to obtain the reaction for the formation of acetylene which is 2C(s)+H2(g)C2H2(g).
Hence, the heat of formation of acetylene is 787286+1310=237 kJ

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