Chemistry - Answer Check

The two common chlorides of Phosphorus, PCl3 and PCl5, both important in the production of other phosphorous compounds, coexist in equilibrium as shown in the balanced chemical reaction below:
PCl3 (g) + Cl2 (g) <-----> PCl5 (g)

At 250 C, an equilibrium mixture in a 2.50 L flask contains 0.305 g PCl5, 0.440 g PCl3, and 4.24 g Cl2.

A. Show the equilibrium Constant formula.

B. What is the value of Kc for this reaction? Hint: Use molarity in the Kc calculations.

My answers:
A.
Kc = [PCl5]/([Cl2][PCl3])
B.
1.826

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  2. 👎 0
  3. 👁 1,285
  1. A is OK.
    I don't get that for B
    What concns do you have for each?

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    2. 👎 0
  2. I got 0.23887323 for Cl2, 0.001281584 for PCl3, and 0.000586862 for PCl5.

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    2. 👎 0
  3. Check that Cl2. 4.24/70.9.2.5 = 0.0239

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    2. 👎 0

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