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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: Suze on May 02, 2005, 09:42:37 AM

Title: Average molecular separation
Post by: Suze on May 02, 2005, 09:42:37 AM
I have been asked to calculate the average separation of two water molecules based on a temperature of 22 deg C and 1 mole, with the partial pressure of the water vapour in the room being 1675 Pa.

Can anyone suggest where to start??!! I've tried using pV=nRT but what am I supposed to do with the calculated volume? I've considered using the density, mole fractions, finding the radius, looking into "mean free path" but I still don't see how any of them lead to the average separation which is usually termed r.

I would be extremely grateful for any *delete me* Thank you,

Suze
Title: Re:Average molecular separation
Post by: Borek on May 02, 2005, 11:41:55 AM
Imagine every particle is in the middle of its own cube. pV=nRT gives molar volume, using Avogadro number you will get volume per particle...