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SECTION A

1.At a temperature of 107°C, the reaction

CO(g) + 2H2(g) CH3OH(g)

reaches equilibrium under a pressure of 1.59 MPa with 0.122 mol of carbon monoxide and 0.298 mol of hydrogen present at equilibrium in a vessel of volume 1.04 dm3.

Use these data to answer the questions that follow.

(a)Assuming ideal gas behaviour, determine the total number of moles of gas present. Hence calculate the number of moles of methanol in the equilibrium mixture.

Total moles..................................................................................................................

....................................................................................................................................

Moles of methanol......................................................................................................

....................................................................................................................................

(3)

(b)Calculate the value of the equilibrium constant, Kc, for this reaction and state its units.

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....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

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(3)

(Total 6 marks)

2.(a)The expression for an equilibrium constant, Kc, for a homogeneous equilibrium reaction is

given below.

(i)Write an equation for the forward reaction.

...........................................................................................................................

(ii)Deduce the units of Kc

...........................................................................................................................

(iii)State what can be deduced from the fact that the value of Kc is larger when the equilibrium is established at a lower temperature.

...........................................................................................................................

(3)

2

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