Using appendix C, calculate the delta S values for the following reactions. In each case explain the sign of delta S.
a.) N2H4(g) + H2(g) ---> 2NH3(g)
b.) 2Al(s) + 3Cl2(g) ----> 2AlCl3(s)
c.) Mg(OH)2(s) + 2HCl(g) ---> MgCl2(s) + 2H2O(l)
d.) 2CH4(g) ----> C2H6(g) + H2(g)