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Calculating Kc

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Given the amount of reactant in grams in a container at a temperature and amount produced in moles, calculate Kc:
A quantity of 6.75 g of SO2Cl2 place in a 2.00 L flask. At 648 K, there is 0.0345 mol of SO2 present. Calculate Kc for the reaction.
SO2Cl2(g) f/r SO2(g)+Cl(g)

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