Question

The reaction below proceeds spontaneously at 298 K.

NH3(g) +Cl2(g)Right arrow.NH4Cl(s)

What is the sign of the entropy change, Delta.S?
Delta.S is negative because the product is less random than the reactants.
Delta.S is negative because the reactants are less random than the product.
Delta.S is positive because the product is less random than the reactants.
Delta.S is positive because the reactants are less random than the product.

Answer 1

Delta S is negative because the product is less random than the reactants.

(2 gases → 1 solid reduces disorder, so entropy decreases.)