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Question

In which of the following reactions ΔH is equal to ΔU?

A
C3H8(g)+5O2(g)3CO2(g)+4H2O(g)
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B
2SO2(g)+O2(g)2SO3(g)
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C
N2(g)+3H2(g)2NH3(g)
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D
CH4(g)+2O2(g)CO2(g)+2H2O(g)
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Solution

The correct option is D CH4(g)+2O2(g)CO2(g)+2H2O(g)
We know,
ΔH=ΔU+ΔngRT

when Δng=0. Then, ΔH=ΔU

for (a)

so, Δng=76=1. So, ΔH is not equal to ΔU

for (b)

Δng=23=1.

for (c)

Δng=24=2.

For (d),

Δng=0. Then, ΔH=ΔU

Clearly, (d) is correct.

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