Calculate ∆G0 for the following reaction.

Question

4XY + 3Z2−→2Z3X2+ 2Y2
Substance ∆H0f S0kJ/mol J/mol·K
XY 205.0 75.0
Y2 −82.0 37.0
Z2 −25.0 78.0
Z3X2 −245.0 137.0
Answer in units of kJ/mol

Answer 1

I would do the following:
Calculate dGo for each substance by dGo - dHo - TdS. Use 298 for T and REMEMBER S is in J/mol and dH is in kJ/mol.

Then dGorxn = (n*dGo products) - (n*dGo products)

Answer 2

-9.1 KJ/MOL

Answer 3

-1367.412 kJ/mol