Evaluate Equilibrium constant Kc

Antimony pentachloride decompose in a gas-phase reaction at high temperatures.
SbCl5(g) —–> SbCl3(g) + Cl2(g)
( a) At some temperature, an equilibrium mixture in a 5.00-L container is found to contain 6.91 g of SbCl5, 16.45 g of SbCl3 and 5.11 g of Cl2. Evaluate Kc, (b) if25.o grams of SbCl5 is placed in the 5.00-L container and allowed to establish equilibrium concentrations or all species?


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