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21) Phosphorus pentachloride decomposes according to the chemical equation. A 0.237 mol sample of PCl5(g) is...

21) Phosphorus pentachloride decomposes according to the chemical equation. A 0.237 mol sample of PCl5(g) is injected into an empty 3.70 L reaction vessel held at 250

Solutions

Expert Solution

Concentration of PCl5 intially = 0.237/3.7 = 0.064M    

                               PCl5    <------------------> PCl3 + Cl2

            at initial                         0.064        0         0

           At equilibrium             0.064 - x   x         x

                                               Kc = [PCl3][Cl2 ]/[PCl5]

                                               1.8 = x2/(0.064-x)

                                            x2 + 1.8x - 0.115 = 0

                                                     x = 0.05

At eqilibrium

[PCl5] = 0.064 - x = 0.064 - 0.05

           = 0.014M

[PCl3] = [Cl2] = x = 0.05M


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