Sulfuryl chloride vapour breaks down on heating: SO₂Cl₂(g) ⇌ SO₂(g) + Cl₂(g)…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Sulfuryl chloride vapour breaks down on heating: . Some is put into an empty rigid flask at . If none of it broke down, its pressure would be . Once equilibrium is reached at , the total pressure is . Treat the gases as ideal and take .
- What is at ?
- What fraction of the has broken down?
- What is at ?
- The same equilibrium mixture is moved into a flask of twice the volume, still at . What is the total pressure once equilibrium is restored?
- What fraction of the has now broken down?
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Plan. The rise in total pressure tells you how far the reaction has gone. Then use again for the larger flask.
(a) . At equilibrium and . The total is , so and
(b) Fraction. .
(c) . .
(d) Twice the volume. The same amount of material in twice the volume behaves as if it had started at . Then
The total pressure is . Without any shift it would have been only : lowering the pressure moves the equilibrium to the side with more moles of gas.
(e) New fraction. , larger than before.
Check. Working instead in moles and concentrations with , for a flask of and then , gives the same two fractions.
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