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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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Calculating Kc and Kp of Reverse Reaction

The equilibrium constant Kc for the reaction shown below is 3.8 x 10-5 at 727°C.

I2(g) = 2 I(g)

Calculate Kc and Kp for the following equilibrium at the same temperature.

2 I(g)= I2(g)

Since they give us first rxn Kc do I first take the inverse (to get the Kc for the second rxn)and then figure the Kp? Is this right? Can you show me?

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