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Question

ΔUo of combustion of methane is X kJ mole1. The value of ΔHo is:
  1. =ΔU0
  2. <ΔU0
  3. >ΔU0
  4. =0

A
<ΔU0
B
=ΔU0
C
>ΔU0
D
=0
Solution
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The correct option is B <ΔU0
ΔUo of combustion of methane is X kJ mole1. The value of ΔHo is <ΔU0
For the combustion of methane, Δn is negative.
Hence, ΔHo=ΔUo+ΔnRT<ΔUo

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