At equilibrium, a 1.00 L flask contains: 0.750 mol of PCl5, 0.500 mol of H2O, 7.50 mol of HCl, and 5.00 mol of POCl3. Calculate the equilibrium constant for this reaction: PCl5 (s) + H2O (g) ⇄ 2HCl (g) + POCl3 (g)

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At equilibrium, a 1.00 L flask contains: 0.750 mol of PCl5, 0.500 mol of H2O, 7.50 mol of HCl, and 5.00 mol of POCl3. Calculate the equilibrium constant for this reaction: PCl5 (s) + H2O (g) ⇄ 2HCl (g) + POCl3 (g)

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Step 1

The equilibrium constant expression for the above reaction will be given by 

Kc = [HCl]2 X [POCl3] / [H2O] 

where [H2O] = concentration of H2O

[POCl3] = concentration of POCl3 

And [HCl] = concentration of HCl

Since the PCl5 is solid. And the concentration of solid (s) and liquid (l) components dont appear in the equilibrium constant

Hence PCl5 is not present in the equilibrium constant expression 

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