Adjust the volume to maximize the product yield

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daphnelee-mh
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Homework Statement
Adjust the volume to maximize the product yield
Relevant Equations
Le Chatelier's principle
Printed question 12 asking how to adjust the volume of a reaction vessel to maximize product yield, with two equilibrium reactions: Na2O2(s) ⇌ 2 Na(l) + O2(g) and C2H2(g) + H2(g) ⇌ C2H4(g).

The answer given for (2) is " lower pressure" , isn't increase pressure, the reaction will proceed towards fewer moles of gas, therefore increase the product yield for this question.
 
That's a silly answer (the given answer, not yours) because the question asks how you would adjust the volume. Of course, for a given amount of gas, changing the volume will change the pressure too. For 2, reducing the volume would increase the pressure and drive the reaction to the right.
 
Probably a mistake in the solution manual where the word “pressure” was used in place of the word ”volume”.