Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is −42.0 kJ mol−1.
[Given: R=8.314J K−1mol−1]
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Solution
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N2+3H2→2NH3
Δn=2−(1+3)=−2
ΔH=ΔU+ΔnRT
ΔU=ΔH−ΔnRT
ΔU=−42.0kJ/mol−[(−2)×8.314×10−3kJ/mol/K×298K]
ΔU=−37.0kJ/mol
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