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Question

If the heat of formation of No2 is
[12N2(g)+O2(g)NO2(g)] the heat of reaction
N2(g)+O2(g)2NO(g) is y and the heat of reaction
2NO(g)+O2(g)2NO2(g) is z, then:

A
2x+z=y
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B
2y+z=x
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C
2xz=y
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D
2z+x=y
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Solution

The correct option is C 2xz=y
12N2(g)+O2(g)NO2(g),rH1=x(i)
N2(g)+O2(g)2NO(g),rH2=y
Reversing,
2NO(g)N2(q)+O2(q),rH3=y(ii)
(i)×2+(ii) gives,
2NO+O2(g)2NO2,rH4=2xy(iii)
But for (iii),rH=z
2xy=z
2xz=y

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