Physical Chemistry Help. Thank you.?

[匿名]

2020-08-24 1:20 pm

Phosgene is formed when carbon monoxide gas reacts with chlorine gas.
CO (g) + Cl2 (g) = COCl2

At 668 K if the initial pressure of CO is 0.456 bar and that of Cl2 gas is 0.468 bar, the total pressure at equilibrium is 0.586 bar. Calculate the pressure equilibrium constant for this reaction.

更新1:

The answer should be 22 bar ^-1

回答 (1)

micatkie

2020-08-24 3:17 pm

✔ 最佳答案

                       CO(g)     + Cl₂(g)    =    COCl₂(g)     Kp
Initial (bar):    0.456       0.468       0
Change (bar): -y                   -y      +y
Eqm (bar):    (0.456 - y)    (0.468 - y)    y

Total pressure at equilibrium:
(0.456 - y) + (0.468 - y) + y = 0.586
0.924 - y = 0.586
y = 0.338

At equilibrium:
𝑃CO = (0.456 - 0.338) bar = 0.118 bar
𝑃Cl₂ = (0.468 - 0.338) bar = 0.130 bar
𝑃COCl₂ = 0.338 bar

Pressure equilibrium constant, Kp
= 𝑃COCl₂ / (𝑃CO × 𝑃Cl₂)
= 0.338 / (0.118 × 0.130) bar⁻¹
= 22.0 bar⁻¹

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