A sealed 1.0-L flask, initially containing 0.20 M COCl2, 0.20 M Cl2, and 0.20 M CO,...

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A sealed 1.0-L flask, initially containing 0.20 M COCl2, 0.20 MCl2, and 0.20 M CO, is heated to 700 K
and allowed to come to equilibrium.
COCl2(g) â‡Œ Cl2(g) + CO(g) Kc = 0.12at 700 K
a. What are the molar concentrations of COCl2, Cl2, and CO oncethe reaction has reached equilibrium
at 700 K?
COCl2:_______________
Cl2:_
CO:_
b. 0.10 mol COCl2 is added to the equilibrium mixture. What arethe molar concentrations of COCl2,
Cl2, and CO once equilibrium is re-established?
COCl2:_
Cl2:_
CO:_______________

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3.7 Ratings (570 Votes)

Â Â COCl2(g) â‡Œ Cl2(g) + CO(g)

IÂ Â Â Â Â Â Â Â Â 0.2Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.2Â Â Â Â Â Â 0.2

CÂ Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â +x

EÂ Â Â Â Â 0.2-xÂ Â Â Â Â Â Â Â Â Â Â Â 0.2+xÂ Â Â Â Â 0.2+x

Â Â Â Â Â Â KcÂ Â = [Cl2][CO]/[COCl2]

Â Â Â Â 0.12Â Â = (0.2+x)(0.2+x)/(0.2-x)

Â Â Â Â 0.12*(0.2-x)Â Â = (0.2+x)(0.2+x)

Â Â Â Â Â Â x = -0.033

[COCl2] = 0.2-(-0.033) = 0.233M

[CO]Â Â Â Â Â = 0.2+x = 0.2-0.033Â Â = 0.167M

[Cl2]Â Â = 0.2+xÂ Â Â Â = 0.2-0.033Â Â = 0.167M

Â Â Â Â Â Â Â Â Â Â Â Â Â Â COCl2(g) â‡Œ Cl2(g) + CO(g)

Â Â IÂ Â Â Â Â Â Â Â Â 0.1Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â 0

CÂ Â Â Â Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â +x

EÂ Â Â Â Â 0.1-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â +x

Â Â Â Â Â Â Â Â Â Â KcÂ Â = [CO][Cl2]/[COCl2]

Â Â Â Â Â Â Â Â Â 0.12Â Â = x*x/0.1-x

Â Â Â Â Â Â Â Â Â Â Â x²Â Â = 0.12*(0.1-x)

Â Â Â Â Â Â Â Â Â Â Â Â Â Â x = 0.065

Â Â Â Â Â Â Â Â Â Â [COCl2]Â Â = 0.1-x = 0.1-0.065 = 0.035M

Â Â Â Â Â Â Â Â Â [CO]Â Â Â Â Â Â Â = x = 0.065M

Â Â Â Â Â Â Â Â Â [Cl2]Â Â Â Â Â = x = 0.065M

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A sealed 1.0-L flask, initially containing 0.20 M COCl2, 0.20 M Cl2, and 0.20 M CO,...

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Chemistry

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