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Q.

For N2+3H2  2NH3, enthalpy and internal energy changes respectively are,  H and  U, then

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a

b

H > U

c

H < U

d

H = 0

answer is C.

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Detailed Solution

H =U+ngRT N2 +  3H2   2 NH3 ng =no.of moles of gaseous products -no. of moles of gaseous reactants ng =2-4=-2 ng<0 so H<U

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