A-LevelChemistryEquilibriaOct/Nov 2016Paper 1 Q111 Mark
Lithium reacts with nitrogen at room temperature to form solid Li₃N. Three vessels of equal volume are connected by taps, A and B, as shown. [Figure showing three connected vessels with taps A and B, contents are evacuated, N2(g) + 3H2(g) <=> 2NH3(g) at equilibrium, and Li] At the start, A and B are closed, the left-hand vessel is evacuated, the middle vessel has the indicated reaction at equilibrium and the right-hand vessel contains lithium only. Which action would allow the equilibrium mixture to contain the most ammonia?
AKeep both A and B closed.
BOpen both A and B.
COpen A only.
DOpen B only.
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The correct answer is A. This question tests the candidate's understanding of equilibria within the Chemistrysyllabus. The examiner's mark scheme requires...
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