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

Question

Using reaction free energy to predict equilibrium compo... Consider the following equilibrium: Now suppose a reaction vessel is filed with 2.39 atm of ammonia (NH,) and 7, 16 atm of nitrogen (N) at 59. 'C. Answer the folowing questions about this system: rise O fall In other words, f you said the pressure of NH, will tend to rise, can that echanged to a tendency to far by addngH!Similary, ir you sa the pressure of NH, will tend to fal, can that be changed to a tendency to rise by adding H.2? you said the pressure of H2 needed to reverse it 20

Explanation / Answer

a.

since no H2 is added, then, the reaciton will proceed toward sH2 production

this implies, NH3 will reac tto form more N2 and H2

NH3 decreaes/falls

b

yes, we can add H2 in order to avoid NH3 reaction

c)

dG = 34 kJ = 34000

dG = -RT*ln(K)

34000 = -8.314*(59+273) * ln(K)

K = exp(-34000 /(8.314*(59+273))

K = 0.0000044717

then

Q = [N2][H2]^3 /[NH3]^2

0.0000044717 = 7.16 * P-H2^3 / (2.39^2)

P-H2^3 = 0.0000044717 / 7.16 * (2.39^2)

P-H2 = (0.000003567)^(1/3)

P-H2 = 0.0152 atm

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