sity, Lima-CHEM 1220-Spring18-HAMILTON> Activities and Due Dates HW 13 02/20/201

Question

sity, Lima-CHEM 1220-Spring18-HAMILTON> Activities and Due Dates HW 13 02/20/2018 11:55 PM 72.7/100 O 2/15/2018 09:31 PM Print Calculator Periodic Table Question 21 of 26 University Science Books presented by Saping Leaming General Chemistry 4th Edtion Phosphorus pentachloride decomposes according to the chemical equation K, "1.80 at 250° C G.308 mol sample of PCIs(g) is injected into an empty 325 L reaction vessel held at 250 Calculate the concentrations of PClig) and PCl(g) at equilibrium, Number Number [PCL) [PCI,].. 110 Previous Give Up & Vw n check Answer Next ric," MacBook Pro

Explanation / Answer

        PCl5(g) ---------------> PCl3(g) + Cl2(g)            Kc = 1.80

      molarity of PCl5   = no of moles/volume in L

                                    = 0.308/3.25    = 0.095 M

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

I         0.095                          0              0

C         -x                               +x            +x

E        0.095-x                        +x           +x

     Kc    =   [PCl3][Cl2]/[PCl5]

     1.8    = x*x/0.095-x

     1.8*(0.095-x) = x^2

          x   = 0.09

[PCl5]    = 0.095-x    = 0.095-0.09   = 0.005M

[PCl3]     = x              = 0.09M

   

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