Print CalculatorPeriodic Table Question 20 of 22 correct University Scien ce Boo

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Print CalculatorPeriodic Table Question 20 of 22 correct University Scien ce Books presented by Sapling Leaming General Chemistry 4th Edition Phosphorus pentachloride decomposes according to the chemical equation K,-180 at 250° C A 0.388 mol sample of PCIs(g) is injected into an empty 4.80 L reaction vessel held at 250°C. Calculate the concentrations of PCls(g) and PCls(g) at equilibrium. Number PCI 0.08083 Number There is a hint available! View the hint by clicking on the bottom divider bar on the divider bar again to hide the hint Close O Previous Give Up & View Solution Check Answer Nxt

Explanation / Answer

Initial concentration of PCl5 = moles/Volume

= 0.388/4.80

= 0.08083 M

The reaction with ICE TABLE

PCl5 = PCl3 + Cl2

I 0.08083

C - x +x +x

E 0.0803-x x x

Equilibrium constant expression of the reaction

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

1.80 = [x] [x] /[0.0803-x]

1.80[0.0803-x] = [x] [x]

0.1455 - 1.80x - x2 = 0

x = 0.0775

At equilibrium

[PCl5] = 0.0803-x = 0.0803-0.0775 = 0.0028 M

[PCl3] = x = 0.0775 M

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