Calculate the standard entropy change of the system in each of the following reactions using the standard molar entropy values given here.
(Values for S^θin J K^–1 mol^–1: Cl₂(g) = 165.0,

Fe(s) = 27.30, Fe₂O₃(s) = 87.40, H₂(g) = 130.6,

H₂O(l) = 69.90, H₂O₂(l) = 109.6, Mg(s) = 32.70,

MgO(s) = 26.90, Na(s) = 51.20, NaCl(s) = 72.10,

NH₄NO₃(s) = 151.1, N₂O(g) = 219.7, O₂(g) = 205.0)

a. 2H₂O₂(l) → 2H₂O(l) + O₂(g)

b. NH₄NO₃(s) → N₂O(g) + 2H₂O(g)

c. 2Mg(s) + O₂(g) → 2MgO(s)

d. 2Na(s) + Cl₂(g) → 2NaCl(s)

e. 3Mg(s) + Fe₂O₃(s) → 3MgO(s) + 2Fe(s)