EM 1470 Lecture & Lab Fall 16 ARONSON I Activities and Due Dates l /29/2016 11:5

Question

EM 1470 Lecture & Lab Fall 16 ARONSON I Activities and Due Dates l /29/2016 11:55 PM 86.5/100 11/28/2016 11:22 PM Print Calculator Periodic Table tion 7 of 13 eneral Chemistry 4th Edition University Science Books presented by Sapling Learning Phosphorus pentachloride decomposes according to the chemical equation Pcle(R) K, 1.80 at 250 °C PCIk) Cl A0.340 mol sample of PCIs(g) is injected into an empty 4.90 L reaction vessel held at 250 C. Calculate the concentrations of PCls(g) and PCIs(g) at equilibrium. PCI O Previous Check Answer Nea

Explanation / Answer

initial concentration of PCl5 = number of mol / volume
= 0.340 mol /4.90 L
= 0.0694 M

PCl5 <------->PCl3 + Cl2
0.0694 0 0 (initial)
0.0694-x x x (at equilibrium)

Kc = [PCl3][Cl2]/[PCl5]
1.80 = x*x/(0.0694-x)
x^2 +1.80*x - 0.12492 = 0

solve above quadratic equation for positive x,
x = 0.067 M

[PCl5] = 0.0694-x = 0.0694-0.067 = 0.0024 M
[PCl3]=x = 0.067 M

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