Using reaction free energy to predict equilibrium compo.. Consider the following

Question

Using reaction free energy to predict equilibrium compo.. Consider the following equilibrium Now suppose a reaction vessel is filled with 7.07 am of chlorine C 2 and 6.13 atm of nitrosyl chlonde NOCI about this system: at 1010 Answer the following questions Under these conditions, will the pressure of NOCI tend to rise or fall? fall 2 Is it possible to reverse this tendency by adding NO2 In other words, if you said the pressure of NOCI will tend to nise, can thates be changed to a tendency to fal by adding NO? Smlarly, if you said thena pressure of NOCI will tend to fall, can that be changed to a tendency to rise by adding NO? O no in the the minimum pressure of NO needed to reverse it.

Explanation / Answer

DG0 = - RTlnKp

-41*10^3 = - 8.314*1283lnk

Kp = 46.7

Kp = pNOCl^2/pNO^2*pCl2

as there is no, NO available the equilibrium reaches from backward reaction.

so that, the pressure of NOCl tend to fall : answer : fall

yes , by adding NO, it is possible to reverse this tendency.

Kp = pNOCl^2/pNO^2*pCl2

46.7 = (6.13-x)^2/((x^2)*(7.07+(x/2)))

x = 0.316

minimum pressure of NO required = x = 0.316 atm

answer: 0.32 atm

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