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Question

For which reaction, ΔH>ΔU? (ΔH= change in enthalpy, ΔU= change in internal energy )

A
Fe(s)+5CO(g)Fe(CO)5(l)
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B
C(graphite)+O2(g)CO2(g)
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C
H2O(I)H+(aq)+OH(aq)
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D
CaCO3(s)CaO(s)+CO2(g)
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Solution

The correct option is A Fe(s)+5CO(g)Fe(CO)5(l)
ΔH=ΔU+PΔV
PV=nRT; So, PΔV=ΔnRT
Therefore, ΔH=ΔU+ΔnRT
(Δn=number of gaseous moles of productnumber of gaseous moles of reactant)
When Δn=ve, then the value of ΔnRT=ve,
As a result ΔH>ΔU
A) Δn=05=5
B) Δn=11=0
C) Δn=00=0
D) Δn=10=1

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