If ammonia is manufactured at 356 k, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction are - 93 kj/mol and - 198 j/mol k, respectively?

Question

Chemistry

Brielle Hinton

3 February, 11:58

If ammonia is manufactured at 356 k, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction are - 93 kj/mol and - 198 j/mol k, respectively?

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Answers (1)

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Lydia Cobb · Answer 1

The reaction will be spontaneous if Gibb free energy is negative, according the following relation:

G = H - T*S

where G is Gibbs free energy, T is change of enthalpy, T is temperature and S is change of entropy

In the case of ammonia:

G = - 93000 - 356 * (-198) = - 93000 + 70488 = - 22512 j/mol

As G < 0 then the reaction is spontaneous.