the standard we entropies of N2 , H2 and NH3 are 191.5 , 130.5 , 192.6JK mol.the value lf S of formation of ammonia is

Balance it like 1/2n2 +3/2h2->nh3
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That's all..

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Multiply with stoichiometric coefficients and then divide by two for 1 mole NH3

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-98.9J/K/mol
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do yourself.
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