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Question

For which one of the following equations is ΔHo (reaction) equal to ΔHo (formation) for the product?

A
N2(g)+O3(g)N2O3(g)
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B
CH4(g)+2Cl2(g)CH2Cl2(g)+2HCl(g)
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C
Xe(g)+2F2(g)XeF4(g)
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D
2CO(g)+O2(g)2CO2(g)
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Solution

The correct option is C Xe(g)+2F2(g)XeF4(g)
The heat of formation is defined as the heat generated or absorbed when the compound is formed form its component elements in their standard state.
By this defination, B and D are clearly not correct as the starting materials are compounds.
A is not correct, since ozone is not correct standard state of oxygen.
So, C is the correct answer.

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