Equilibria

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Question 4
Medium

Sulfur trioxide is made in the Contact process. This is the balanced symbol equation for this process:

2SO2(g)+O2(g)⇌2SO3(g)2\text{SO}_2(\text{g}) + \text{O}_2(\text{g}) \rightleftharpoons 2\text{SO}_3(\text{g})2SO2​(g)+O2​(g)⇌2SO3​(g)

a.

The reversible reaction is carried out in a closed system.

State how you can tell that you are representing a reversible reaction in this equation.

[1]
b.

What is a closed system?

[1]
c.

If dynamic equilibrium is reached, which of these statements are correct?

Select two statements.

  • Only sulfur trioxide, SO3\text{SO}_3SO3​, is being made.
  • The amounts of reactants and products remain constant.
  • The forward and backward reactions are happening at the same rate.
  • The forward reaction is faster than the backward reaction.
  • The reaction has stopped.
[2]
d.

The position of equilibrium can be altered by changing the pressure.

Suggest one other change that could be made to the reaction conditions.

[1]
e.

A chemical plant predicts they will make 500 tonnes500\text{ tonnes}500 tonnes of sulfur trioxide.

They actually make 415 tonnes415\text{ tonnes}415 tonnes of sulfur trioxide.

Calculate the percentage yield.

[2]
f.

State why this reaction has an atom economy of 100%100\%100%.

Use the balanced symbol equation.

[1]

Equilibria Questions

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