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How Far? The Extent of Chemical Change · Paper 2 — Free Chemistry SL Practice Questions

1ChallengeSAQ-LCalculating equilibrium constants (Kc)7 marksPaper 2~11 min

Methanol is produced industrially from synthesis gas according to the reversible reaction:

\text{CO}(g) + 2\text{H}_2(g) \rightleftharpoons \text{CH}_3\text{OH}(g)

A chemist mixes

1.00\,\text{mol}

\text{CO}(g)

and

2.00\,\text{mol}

\text{H}_2(g)

in a

10.0\,\text{dm}^3

reactor at

500\,\text{K}

. At equilibrium, the concentration of

\text{CH}_3\text{OH}(g)

0.0400\,\text{mol}\,\text{dm}^{-3}

(a)

Calculate the equilibrium constant,

K_c

, for this reaction at

500\,\text{K}

. [3 marks]

(b)

After equilibrium is established, an additional

0.500\,\text{mol}

\text{CO}(g)

is injected into the reactor at constant volume and temperature. Calculate the reaction quotient,

Q_c

, immediately after injection and deduce the direction in which the reaction will proceed. [3 marks]

(c)

Evaluate the effect on the value of

K_c

if the volume of the reactor were halved at constant temperature, assuming equilibrium is re-established. [1 mark]

Solutions

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