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session.masteringchemistry.com https:// https:// Chegg Study Chegg Study Chegg Study Chegg Study Chegg Study Course Home Part A For the following reaction, Kc 255 at 1000 K CO(g) Cl2 (gCOC2 (g) A reaction mixture initially contains a CO concentration of 0.1490 M and a Cl2 concentration of 0.175 Mat 000 K Note: in multi-step calculations, you may round only at the end. What is the equilibrium concentration of CO at 1000 K? Express your answer in molarity to three significant figures. CO Submit XIncorrect; Try Again Part B What is the equilibrium concentration of Cl2 at 1000 K? Express your answer in molarity to three significant figures. Chl- 3.95*102 M Previous Answers Correct

Explanation / Answer

Balanced equation with ICE table

CO + Cl2 = COCl2

I 0.149 0.175

C - x - x +x

E 0.149-x 0.175-x x

Equilibrium constant expression of the reaction

Kc = [COCl2] /[CO] [Cl2]

255 = x/[(0.149-x) *(0.175-x )]

255[(0.149-x) *(0.175-x )] = x

6.649125 - 37.995x - 44.625x + 255x2 - x = 0

6.649125 - 83.62x + 255x2 = 0

x = 0.1355

At equilibrium

[Cl2] = 0.175 - x = 0.175 - 0.1355 = 0.0395 = 3.95*10^-2 M

[CO] = 0.149 - x = 0.149 - 0.1355 = 0.0135 = 1.35*10^-2 M

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