Equilibria

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Question 3
Medium

Methanol is produced industrially. The balanced symbol equation for this process is:

CO+2H2⇌CH3OH\text{CO} + 2\text{H}_2 \rightleftharpoons \text{CH}_3\text{OH}CO+2H2​⇌CH3​OH

a.

The reaction is carried out in a closed system.

State how you can tell from the equation that this reaction is reversible.

[1]
b.

What is a closed system?

[1]
c.

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

Select two correct statements:

  • The forward reaction has completely stopped.
  • The rates of the forward and reverse reactions are equal.
  • Only methanol, CH3OH\text{CH}_3\text{OH}CH3​OH, is present in the mixture.
  • The concentrations of reactants and products remain constant.
  • The forward reaction is much faster than the reverse reaction.
[2]
d.

The equilibrium position can be altered by changing the reaction temperature. Suggest one other change that could be made to the reaction conditions to alter the equilibrium position.

[1]
e.

A chemical plant predicts they will produce 750750750 tonnes of methanol. They actually produce 540540540 tonnes of methanol. Calculate the percentage yield of methanol.

[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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