Using S values from Appendix C, calculate S values for the following reactions. In each case account

Using S° values from Appendix C, calculate ΔS° values for the following reactions. In each case account for the sign of ΔS°.
(a) C2H4(g) + H2 (g) → C2H6(g)
(b) N2O4(g) → 2 NO2(g)
(c) Be1OH2 (s) → BeO(s) + H2O(g)
(d) 2 CH3OH(g) + 3 O2(g) → 2 CO2(g) + 4 H2O(g)