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Question

2H2(g)+O2(g)2H2O(g)
For this reaction relate ΔH and ΔU.

A
ΔH =ΔU
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B
ΔH > ΔU
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C
ΔH < ΔU
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D
None of these
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Solution

The correct option is B ΔH < ΔU
As we know,
ΔH =ΔU+ΔngRT
here,
2H2(g)+O2(g)2H2O(g)
Δng=212=1
so,
ΔH =ΔURT
ΔH < ΔU

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