Jada P.

asked • 11/02/19

Confusing Chemistry Math Question

If a closed vessel is charged with 65000.0 Pa of nitric oxide and allowed to react with excess liquid bromine, what is the equilibrium partial pressure of the product?

NO(g) + 1/2 Br2(l) ↔ NOBr(g) Keq=8.504E-4

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Brant C. answered • 11/05/19

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PNOBr/PNO = K


(x)/(65000.0-x)=8.5x10-4


x=55.20Pa = PNOBr


Since Br2 is a liquid, it has no role in the equilibrium expression.

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J.R. S.

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The equilibrium constant provided is Kc and not Kp, so I'm under the impression that one should use Kp = Kc(RT)^∆n. Since ∆n is 0, this will reduce to Kp = Kc = Keq, etc. so the provided solution should work. Just wanted to point this out in case it's important for some reason.
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11/05/19

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