phosphorous pentachloride decomposes according to the chemical reaction. PCl5 =

Question

phosphorous pentachloride decomposes according to the chemical reaction. PCl5 = PCl3 + Cl2. Kc= 1.80. A 0.292 mol sample of PCl5 is injected into an empty 4.00 L reaction vessel held at 250 degrees C. Calculate the concentrations of PCl5 and PCl3 at equilibrium t 3/26/2017 11:55 PM zzB/100 3/26/2017 11:51 AM Print I Calculator Periodic Table Question 10 of 25 General Chemistry 4th Edition University Science Books presented by Sapling Leaming Phosphorus pentachloride decomposes according to the chemical equation PCI Ke 1.80 at 250 o C A o.292 mol sample of PCI5(g) is injected into an empty 4.00 L reaction vessel held at 250 eC. calculate the concentrations of PCIs(g) and PCI3(g) at equilibrium. Number Number D PCI,- Hint O Previous ® Siw up s view salition Check Answer about

Explanation / Answer

initial [PCl5] = 0.292 mol/4 L = 0.073 M

let x be the change ar equilibrium,

then,

K = [PCl3][Cl2]/[PCl5]

1.80 = x^2/(0.073 - x)

x^2 + 1.80x - 0.1314 = 0

x = 0.070 M

So equilibrium concentration of,

[PCl5] = 0.073 - 0.070 = 0.003 M

[PCl3] = 0.070 M

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