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Question

For which of the following equation will ΔH be equal to ΔU.


A

H2(g)+12O2(g)H2O(l)

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B

H2(g)+I2(g)2HI(g)

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C

2NO2(g)N2O4(g)

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D

3NO2(g)+O2(g)2N2O5(g)

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Solution

The correct option is B

H2(g)+I2(g)2HI(g)


ΔH=ΔU+ΔngRT

if Δng =zero; ΔH=ΔU

So, the number of gaseous moles on the reactants and the products side must be the same. This is seen in option b


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