# Homework Help: Finding number density and average distance between molecules

1. Dec 2, 2011

### lalahelp

1. The problem statement, all variables and given/known data

At 0.0° C and 1.00 atm, 0.95 mol of a gas occupies a volume of 0.0213 m3.

(b) Estimate the average distance between the gas molecules.

Last edited: Dec 2, 2011
2. Dec 2, 2011

### technician

Do you know that 1 mole means 6.02 x 10^23 particles?
You have 0.95 moles so can you see how to calculate the 'number density' i.e the number of particles per m^3

3. Dec 2, 2011

### lalahelp

so divide the 6.02e23 by .95?

4. Dec 2, 2011

### technician

Not divide by 0.95. You have 0.95 OF 1 mole

5. Dec 2, 2011

### lalahelp

ohh multiply them and then do the same thing as I did before.

6. Dec 2, 2011

### technician

see what you get

7. Dec 2, 2011

### lalahelp

6.02e23*.95*1*272/.0213= 7.3e27

8. Dec 2, 2011

### technician

you are being blinded by equations !!! You have the number of molecules correct and you have the volume.... that is all you need to get the 'number density'
The pressure and temperature are not needed for this part.