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Q.

Consider the reaction : N2 + 3H2   ⇌  2NH3 carried out at constant pressure and temperature. If ∆H and ∆U are change in enthalpy and change in internal energy respectively, then

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a

∆H =0

b

∆H = ∆U

c

∆H < ∆U

d

∆H > ∆U

answer is C.

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Detailed Solution

∆H = ∆U+∆ngRT ∴  ∆ng=2 -4=-2 ∴ ∆H < ∆U
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Consider the reaction : N2 + 3H2   ⇌  2NH3 carried out at constant pressure and temperature. If ∆H and ∆U are change in enthalpy and change in internal energy respectively, then