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(B) The average distance between molecules,denoted as $d$,is related to the number density $n$ as $d \propto n^{-1/3}$.If the distance $d$ is doubled

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$P/8$

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(B) The average distance between molecules,denoted as $d$,is related to the number density $n$ as $d \propto n^{-1/3}$.If the distance $d$ is doubled $(d' = 2d)$,then the number density $n$ changes as $n' = n/8$.According to the ideal gas law,$P = nkT$. Since the temperature $T$ is constant,the pressure $P$ is directly proportional to the number density $n$ $(P \propto n)$.Therefore,$P' = P 	imes (n'/n) = P 	imes (1/8) = P/8$.Thus,the pressure becomes $P/8$.

If the distance between molecules is doubled at a constant temperature,the pressure will become .......

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