Question

delta S is positive for the reaction

a) CaO(s)+CO2(g)-->CaCO3(s)

b) H2O(l)--> H2O(s)

c) N2(g)+ 3H2(g)--> 2NH3(g)

d) 2SO3(g)--> 2SO2(g)+O2(g)

e) Ag+(aq)+Cl-(aq)--> AgCl(s)

Answer 1

entropy of gas > entropy of aqueous > entropy of liquid > entropy of solid

in A entropy decreases as reactant has more gases. So, delta S is negative

in B entropy decreases as reactant has liquid and product has solid. So, delta S is negative

in C entropy decreases as reactant has more gases. So, delta S is negative

in D entropy increases as reactant has less gases. So, delta S is positive

in E entropy decreases as reactant has aqueous and product has solid. So, delta S is negative

Answer: D