Question

The reaction

SO2(g)+2H2S(g) ⇌ 3 S(s)+2H2O(g)

is the basis of a suggested method for removal of SO2, a pollutant that irritates airways causing coughing, from power-plant stack gases.

The values below may be helpful when answering questions about the process.

Substance	ΔG∘f (kJ/mol)	ΔH∘f (kJ/mol)
H2O(g)	−228.6	−241.8
H2O(l)	−237.1	−285.8
SO2(g)	−300.4	−296.9
SO3(g)	−370.4	−395.2
H2S(g)	−33.01	−20.17
S(s)	0	0

PART A:

Calculate the equilibrium constant Kp for the reaction at a temperature of 298 K.

Express the equilibrium constant to one significant figure.

PART B:

In principle, is this reaction a feasible method of removing SO2 from power-plant emissions?

No; the reaction is highly spontaneous at 298 K, but a significant amount of SO2 will remain at equilibrium.

Yes; the reaction is highly spontaneous at 298 K, even though a significant amount of SO2will remain at equilibrium.

Yes; the reaction is highly spontaneous at 298 K and almost no SO2 will remain at equilibrium.

No; the reaction is not spontaneous at 298 K, even though almost no SO2 will remain at equilibrium.

No; the reaction is not spontaneous at 298 K and a significant amount of SO2 will remain at equilibrium.

PART C:

Assume that the partial pressure of sulfur dioxide, PSO2, is equal to the partial pressure of dihydrogen sulfide, PH2S, and therefore PSO2=PH2S. If the vapor pressure of water is 28 torr , calculate the equilibrium partial pressure of SO2  (PSO2) in the system at 298 K.

Express the pressure in atmospheres to two significant figures.

PART D

Using Le Châtelier's principle, determine how the process is affected after each of the following temperature or pressure changes. Consider that a more effective reaction produces more product or more product in a shorter amount of time.

Drag the appropriate items to their respective categories: More effective, Less effective, Equally effective

-Pressure decreases by increasing the container size. -Pressure increases by decreasing the container size. -Temperature increases while maintaining the container size. -Temperature decreases while maintaining the container size.

Answer 1

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