Calculate ∆S° for C₃H₄(g) + 2 H₂(g) → C₃H₈(g).

Question

C3H4(g) = 266.9

H2(g) = 130.6

C3H8(g) = 269.9

Answer 1

As in your previous question, we will sum the products and then subtract the sum of the reactants.

Sum of products = 1 x 269.9 = 269.9

Sum of reactants = 1 x 266.9 + 2 x 130.6 = 266.9 + 261.2 = 528.1

products - reactants = 269.9 - 528.1 = -258.2 J/K-mol (even though you didn't supply units)