For each reaction, predict the sign and find the value of ΔS∘:

For each reaction, predict the sign and find the value of ΔS∘:

a) 3NO(g)⟶N2O(g)+NO2(g)
b) 3H2 (g)+Fe2O3(s)⟶2Fe(s)+3H2O(g)
c) P4(s)+5O2(g)⟶P4O10(s)