Calculate Delta G of a rxn

Question

A=387.7  B= -609.4  C= 402.0     delta Gf (Kj/mol)

Use the data given in the table to calculate the value of  delta G rxn at  25 C for the reaction described by the equation A + B---><---- C

in Kj/mol

Answer 1

A + B <==> C

∆G_rxn = ∆G_formation products - ∆G_formation reactants

∆G_rxn = 402.0 - [(387.7 + (-609.4)] = 402.0 - (-221.7)

∆G_rxn = 623.7 kJ/mole