0 8/23/2016 12:00 AM 25/508/21/2016 10:16 PM Gradebook Print Cakuletor-Periodic

Question

0 8/23/2016 12:00 AM 25/508/21/2016 10:16 PM Gradebook Print Cakuletor-Periodic Table Question 4 of 6 incorrect S Incorrect incorrect 3 noorrect General Chemistry 4th Edition Maps University Science Books presented by Sapling Leamning Phosphorus pentachloride decomposes according to the chemical equation K. 1.80 at 2500 c A0.309 mol sample of PCs(g) is injected into an empty 4.85 L reaction vessel held at 250 Calculate the concentrations of PCIs(g) and PCla(g) at equilibrium. Number PCI0616 Number [PCL, 0033M There is a Hint availablel View the hint by cicking on the divieer bar again to hide the hint Close bottom divider on the O Pnevicus Gove, Up & View Solution e Check Answer 0 Next Exit

Explanation / Answer

    PCl5 --------> PCl3 + Cl2

I               0.309                0           0

C              -x                     +x          +x

E            0.309-x               +x           +x

                    [PCl5]   = 0.309-x/4.85

                     [PCl3]   = x/4.85

                     [Cl2]     = x/4.85

          Kc   = [PCl3][Cl2]/[PCl5]

            1.8   = x/4.85 * x/4.85/0.309-x/4.85

            1.8   = x2/4.85*(0.309-x)

           8.73*(0.309-x) = x2

             x = 0.298

       [PCl5]   = 0.309-x/4.85   = 0.309-0.298/4.85 = 0.00226M

                     [PCl3]   = x/4.85   = 0.298/4.85     = 0.0614 M

                     [Cl2]     = x/4.85 = 0.298/4.85     = 0.0614 M

         A-------> 2B

I     2.1            0

C   -x               2x

E    2.1-x         2x

Kc   = [B]2/[A]

2.18*10-6         = (2x)2/2.1-x

2.18*10-6 *(2.1-x) = 4x2

                       x      = 0.001069M

         [A]    = 2.1-x = 2.1 -0.001069 = 2.098M

         [B] = 2x     = 2*0.001069         = 0.002138M

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