Using the standard entropy values: C2H4(g), S° = +219.8 J mol-1 K-1 H2(g), S° = +130.6 J mol-1 K-1 C2H6(g), S° = +229.5 J mol-1 K-1 calculate the standard entropy change, ∆S°, for the reaction: C2H4(g) + H2(g) → C2H6(g)