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Questions  

Given:

 C( graphite )+2H2(g)CH4(g);     ΔH1C(g)+4H(g)CH4(g);     ΔH2

which one of the following is true?

a
ΔH1=ΔH2
b
ΔH1>ΔH2
c
ΔH1<ΔH2
d
ΔH1=2ΔH2

detailed solution

Correct option is B

The equation C (graphite )+2H2(g)CH4(g) may be considered as the sum of the following three equations.

C (graphite) C(g)ΔHa2H2(g)4H(g)ΔHbC(g)+4H(g)CH4(g)ΔH2

Hence ΔH1=ΔHa+ΔHb+ΔH2

Since ΔHa and  ΔHb are positive,  ΔH1>ΔH2

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