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(A) At $STP$,$1 \,mole$ of an ideal gas occupies a volume $V = 22.4 	imes 10^{-3} \,m^3$.The number of molecules in $1 \,mole$ is given by Avogadro's

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$1 \,nm$

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(A) At $STP$,$1 \,mole$ of an ideal gas occupies a volume $V = 22.4 	imes 10^{-3} \,m^3$.The number of molecules in $1 \,mole$ is given by Avogadro's number,$N_A \approx 6.022 	imes 10^{23}$.The volume available per molecule is $v = \frac{V}{N_A} = \frac{22.4 	imes 10^{-3}}{6.022 	imes 10^{23}} \approx 3.72 	imes 10^{-26} \,m^3$.The average distance $d$ between molecules is approximately the cube root of the volume per molecule:$d \approx (v)^{1/3} = (3.72 	imes 10^{-26})^{1/3} \,m$.$d \approx 3.34 	imes 10^{-9} \,m = 3.34 \,nm$.Thus,the order of magnitude of the average distance between molecules is $1 \,nm$.

The average distance between molecules of an ideal gas at $STP$ is approximately of the order of

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