Q.

For the reaction As+3Bg→4Cs+Dl⋅ΔH and ΔU are related as …….

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a

ΔH=ΔU

b

ΔH=ΔU+3RT

c

ΔH=ΔU+RT

d

ΔH=ΔU−3RT

answer is D.

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Detailed Solution

A(s)+3B(g)→4C(s)+D(l)Δng=0−3=−3;ΔH=ΔE+ΔngRT[∵ΔE=ΔU]∴ΔH=ΔU+(−3)(RT)ΔH=ΔU−3(RT):ΔH=ΔU−3RT.
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For the reaction As+3Bg→4Cs+Dl⋅ΔH and ΔU are related as …….