Question

# Ammonia gas combines with oxygen gas to produce liquid water and nitrogen gas. a) Write a...

Ammonia gas combines with oxygen gas to produce liquid water and nitrogen gas. a) Write a balanced equation for the equilibrium reaction b) Write the expression for the equilibrium constant c)Calculate Keq if the equilibrium concentrations of the following components are: [NH3]=0.3M; [O2]=0.5M; [H2O]=55.6M; [N2]=2.0M d) Experiments show that this reaction is endothermic, what effect will raising the temperature have on the position of equilibrium? Explain. Explain why a reaction reaches equilibrium and why we refer to it as a dynamic equilibrium.

a)

The raction

2NH3 + 3/2O2 = 3H2O + N2

b)

the K eq

Ke = [H2O]^3[N2]/[NH3]^2[O2]^(3/2)

since activity of water = 1

Keq =  [N2]/[NH3]^2[O2]^(3/2)

c)

calculate if

Keq =  [2]/[0.3]^2[0.5]^(3/2)

Keq = 62.83

d)

if you increase T, then you will favour production of water and gas, since they require T to b eproduced, the shift goes to right

dyunamic equilibrium = the overall change is zero, but there is still movement of moleucles (i.e rate in = 2 and rate out = 2, the overal 2-2 = 0)

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