Question

Which of the following statements best describes the entropy change (∆S) during the reaction shown below?

N2 (g) + 3 H2 (g) → 2 NH3 (g)

A. ∆S<0

B. ∆S=0

C. ∆S>0

D. sign of ∆S depends on the temperature at which the change takes place

E. there is no entropy change in this system

Answer 1

since this reaction involves gases only, total number of moles of products and reactants
determine whether entropy increased or decreased.
entropy increases , if total number of mols of product is more than that of reactant
entropy decreases, if product side has less number of moles than reactant part

so here in this reaction , number of moles of product is lesser than total number of
moles of reactants. Hence entropy decreases , Hence delta S < 0
Answer :

option A) delta S < 0
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