Predict the sign of So, if possible, for each of the following reactions. If you cannot predict

Question:

Predict the sign of ∆So, if possible, for each of the following reactions. If you cannot predict the sign for any reaction, state why.
a. N2H4(l) → N2(g) + 2H2O(g)
b. C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l)
c. P4(s) + 5O2(g) P4O10(s)
d. 2NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g)