O ENTROPY AND FREE ENERGY Using reaction free energy to predict equilibrium comp

Question

O ENTROPY AND FREE ENERGY Using reaction free energy to predict equilibrium compo... Consider the foilowing equilibrium Now suppose a reaction vessel is filled with 292 atm of nitrosyl chloride about this system: NOC) and 1.28 am of chionne ci2 at 43 . Ans er the following questions rise Under these conditions, will the pressure of NOC tend to rise or fall? Is it possible to reverse this tendency by adding NO in other words, if you said the pressure of NOI will tend to rnise, can that be changed to a tendency to fall by adding NO? Simlarly, ir you sad the pressure of NOCI will tend to fa, can that be changed to a tendency to rise by adding NO yes n the If you said the the minimum pressure of NO needed to reverse it

Explanation / Answer

a)

since no NO is given, then the equilbirium ust form more NO

this implies, NOCl will decrease to form more NO

b)

yes, it is, we need to fix it

dG = -RT*ln(K)

-41000 = -8.314*(436+273)*ln(K)

K = exp(-41000 /(8.314*(436+273)))

K = 0.000953

then

Q = [NO]^"[Cl]/[NOCL]^2

0.000953= [NO]^2 * 1.28 / (2.92^2)

P-NO = sqrt(0.000953*(2.922^2))/(1.28 )

P-NO = 0.0704 atm will do

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