The reaction below proceeds spontaneously at 298 k. nh3(g) +cl2(g)nh4cl(s) what is the sign of the entropy change (triangle) s s is negative because the product is less random than the reactants. s is negative because the reactants are less random than the product. s is positive because the product is less random than the reactants. s is positive because the reactants are less random than the product.