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httpslsession masteringchemistry.com/myctitemview?assignmentProblemID 75235380&offset; next Cheat 152 Problem 13,104: Chapter Problem Problem 13.104: Chapter Problem Part A When 1,000 mol of PCIs is introduced into a 5000 L oontainer at 500 K. Caloulate the values of KE and KP. 50% of the Pcis dissociates to give an equilibrium mixture of PCIs. PCIs, and Cla PCIs (g) e POL (a) Ch(g) Submit My Answers Give Up Part B My Answers give Part C If the initial concentrations in a partioular mixture of reactants and products are proceed to reach equilibrium? l In the oiection of formation of PC13 and Cla O In the direction of formation of PCIs

Explanation / Answer

The reaction is

PCl5 ------> PCl3 + Cl2

1 mol 0 0 initial moles

1-0.725 0.725 0.725 moles after reaction

0.275/5 0.725/5 0.725/5 equilibrium concentrations (mol/L)

Part A )

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

= (0.725/5)( 0.725/5)/(0..275/5)

= 0.3822

Part B

we know Kp = Kc (RT)delta n where delta n = number of moles of gaseous products - gaseous reactants

and delta n for the reaction = 2 -1 = 1

Thus Kp = 0.3822 x (0.0821 x 500)

= 15.69 atm

Part D

[PCl5] at equilibrium = 0.275moles/5 L= 0.055 M

[PCl3] at equilibrium = 0.725mol / 5L = 0.145 M

[Cl2] at equilibrium = 0.725mol / 5L = 0.145 M

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