Question

The standard free energy change for a chemical reaction is -18.3kJ/mole. What is the equilibrium constant for the reaction at 87 degrees Celsius? (R=8.314J/K*mol)

Delta G = -Rtlnk

-18,300/8.314/360 = -6.114
It looks like you solved for ln K

They asked for K.

I assume your -18,300/8.314/360 means
-18,300/(8.314*360)

Never write fractions as a/b/c

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