Easy chemistry problem - theoretical yield of a gas?

K B

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Reaction: 2SO2 (g) + O2 (g) --> 2SO3 (g)

278.5 mL of SO2 is allowed to react with 159.3 mL of O2, both measured at 300 K and 53.4 mmHg

What is the theoretical yield of SO3?

I know that SO2 is the limiting reagent, but how do I work with mL of gas when it is not at STP? Someone please explain...
 
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