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Phosphorus and Chlorine gases combine to produce phosphorus trichloride: P2 (g) + 3Cl2 (g) --> 2PCl3...

Phosphorus and Chlorine gases combine to produce phosphorus trichloride: P2 (g) + 3Cl2 (g) --> 2PCl3 (g)

Delta G at 298K for this reaction is -642.9 kJ/mol. What is the value of Delta G at 298K for a reaction mixture that consists of 1.9 atm P2, 1.6 atm Cl2, and 0.65 atm PCl3?

I KNOW HOW TO GET THIS FAR: delta G= -642.9kj/mol+(8.314)(298)ln(0.0543)... I literally just don't know how to solve the arithemetic. I also know the correct anwer should be -650.1. An explanation at this point would be much appreciated, thanks!!

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