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If the volume of a gas doubled at constant temperature, what is the pressure now if it was P atm before the change?

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If the volume of a gas doubled at constant temperature, what is the pressure now if it was P atm before the change?

(a) P atm

(b) 2P atm

(c) P/2 atm

(d) None of the mentioned

I have been asked this question in class test.

Question is from Ideal gas topic in section Material Balances for Multi-Unit Systems and Ideal and Real Gases of Chemical Process Calculation

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Right option is (c) P/2 atm

For explanation I would say: P is inversely proportional to temperature and the volume is constant (PV = nRT).

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