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(C) According to Dalton's Law of Partial Pressures,the total pressure $P$ in the vessel is the sum of the partial pressures of nitrogen $(P_{N_2})$ an

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$P/2$

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(C) According to Dalton's Law of Partial Pressures,the total pressure $P$ in the vessel is the sum of the partial pressures of nitrogen $(P_{N_2})$ and oxygen $(P_{O_2})$.Since the number of molecules of nitrogen and oxygen are equal,their partial pressures are equal: $P_{N_2} = P_{O_2} = P/2$.If nitrogen is removed,only oxygen remains in the vessel.Therefore,the new pressure will be equal to the partial pressure of oxygen,which is $P/2$.

$A$ closed vessel contains an equal number of nitrogen and oxygen molecules at a pressure of $P \ mm$. If nitrogen is removed from the system,then the pressure will be

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