In 500ml flask the degree of dissociation of pcl5 at equilibrium is 40% and the initial amount is 5 moles. The value of equilibrium of pcl5 is
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Answer : The value of equilibrium constant for dissociation of PCl5 is 2.67
Explanation :
The dissociation reaction of PCl5 can be written as,
Let us find the initial concentration of PCl5
[PCl5] = mol/L = 5 mol/0.500 L = 10 M
The degree of dissociation of PCl5 is 40%. That means 40% of the initial amount of PCl5 would dissociate to form the products.
40% of 10 M is 4 M.
This indicates that 4 M of PCl5 would dissociate to form 4 M of PCl3 and 4 M of Cl2.
Please refer to attached ICE table for the equilibrium concentrations of the above gases.
The equilibrium constant kc is calculated as,
Let us plug in the equilibrium values from the ICE table.
The value of equilibrium constant for dissociation of PCl5 is 2.67
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