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Question

The volume of a gas at 0oC and 760 mm pressure is 22.4 cc. Find the no. of molecules present in this volume.

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Solution

From ideal gas equation
PV=nRT
n=PV/RT
=76022.4 ×22.4× 103L/(0.0821L atm/molK ×273)
=0.03 mol×6.022×1023 molecules
=2.041×1022 molecules
2.041×1022 molecules are present in the volume

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