HELP ME WITH THIS I AM SO STRUGGLING A chemical engineer is studying the followi

Question

HELP ME WITH THIS I AM SO STRUGGLING

A chemical engineer is studying the following reaction: At the temperature the engineer picks, the equilibrium constant Kp for this reaction is 3.6 . The engineer charges (fills) four reaction vessels with nitrogen monoxide and hydrogen, and lets the reaction begin. He then measures the composition of the mixture inside each vessel from time to time. His first set of measurements are shown in the table below. Predict the changes in the compositions the engineer should expect next time he measures the compositions.

Explanation / Answer

For the given reaction

Kp = (pN2) (pH2O)2 / (pH2)2(pNO)2 = 3.6 = (xN2) (xH2O)2 / (xH2)2(xNO)2 X Total pressure

The value of Kp remains same if the temperature remains the same.

so case 1

Total pressure = 22.25

(pN2) = 3.38 / 22.25 = 0.152

(pH2O) = 3.59 / 22.25 = 0.161

(pH2) = 5.45 / 22.25 = 0.245

(pNO) = 9.83 / 22.25 = 0.442

Kp = 0.152 X 0.026 / 0.06 X 0.195 = 0.337 < original Kp so to maintain the equilibrium we need to decrease the concentration of reactants and increase concentration of products.

So change in concentration of the following species will be

(N2) = increase

(H2O) = increase

(H2) = decrease

(NO) =decrease

Case 2

Total pressure = 22.52

(pN2) = 3.92 / 22.52 = 0.174

(pH2O) = 4.13 / 22.52 = 0.183

(pH2) = 5.18/ 22.52 = 0.230

(pNO) = 9.29 / 22.52 = 0.412

Kp = 0.174 X 0.0334 / 0.053 X 0.169 = 0.648 < original Kp so to maintain the equilibrium we need to decrease the concentration of reactants and increase concentration of products.

So change in concentration of the following species will be

(N2) = increase

(H2O) = increase

(H2) = decrease

(NO) =decrease

Case 3

Total pressure = 21.75

(pN2) = 2.38 / 21.75 = 0.109

(pH2O) = 2.59 / 21.75= 0.119

(pH2) = 5.95 / 21.75 = 0.273

(pNO) = 10.83 / 21.75 = 0.497

Kp = 0.109 X 0.014 / 0.074 X 0.247 = 0.0.83 < original Kp so to maintain the equilibrium we need to decrease the concentration of reactants and increase concentration of products.

So change in concentration of the following species will be

(N2) = increase

(H2O) = increase

(H2) = decrease

(NO) =decrease

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