uilibrium Constant Using Experimental Data auilibrium Constant Using Experimenta

Question

uilibrium Constant Using Experimental Data auilibrium Constant Using Experimental Det Close Proble Tutored Practice Problem 15.3.2 Use an ICE table to calculate K A mixtare of PCl and Cl is allowed to seact at 509 K The initial concentration of the reactaents are [PC)]-01750 Mand ICa)-199%MAer the spysten reaches equilbrium it i Sound at the Cl concestration ha decreased to 0.0620 M Based on these data, determine the value of the equalibeium constant, K, for this peaction Check & here to search 5 6 8 9 0 e backspa TY U

Explanation / Answer

Solution :-

Lets set up the ICE table for the given reaction

     PCl3(g)    + Cl2(g) ----- > PCl5(g)

I 0.1750 M    0.1990 M           0

C -x                 -x +x

E 0.1750-x      0.0620 M x

Using the equilibrium concentration of the Cl2 we can find the equilibrium concentration of PCl3 and PCl5

Lets calculate the value of x

0.1990 M – x = 0.0620 M

0.1990 M – 0.0620 M= x

0.137 M= x

Equilibrium concentration of PCl3 = 0.1750 M- x

                                                               =0.1750 M-0.137M

                                                                = 0.038 M

Equilibrium concentration of PCl5 = x = 0.137 M

Lets calculate the equilibrium constant using the equilibrium concentrations

K= [PCl5]/[PCl3][Cl2]

K= [0.137 M]/[0.0380 M][0.0620 M]

K= 58.1

Therefore value of equilibrium constant K is 58.1

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