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CHEMISTRY> HELP QUICK! pls

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Calculate the reaction free energy of:
H2(g) + I2(g) 2HI(g)

when the concentrations are 0.026 mol L-1 (H2), 0.33 mol L-1 (I2), and 1.84 mol L-1 (HI), and the temperature is 700K. For this reaction Kc= 54 at 700 K.
+11.6 kJ mol-1
0 kJ mol-1
-11.6 kJ mol-1
+2273 kJ mol-

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