Posted by **Anonymous** on Tuesday, June 8, 2010 at 8:13pm.

consider 2 sample of nitrogen gas. sample 1 contains 1.5 mol of N2 and has a volume of 36.7L at 25C and 1 atm. sample 2 has a volume of 16.5L at 25C and 1 atm. calculate the number of moles of N2 in sample 2

do i use the pv= nrt equation? and do i only use the information given for sample 2 since you are finding moles in sample 2?

so you can ignore the info. for sample 1?

- Chemistry -
**DrBob222**, Wednesday, June 9, 2010 at 1:19pm
You can do this two ways.

One way is to use PV = nRT and, as you say, ignore sample 1.

(1 atm)(16.7 L) = n*0.08206*298 and solve for n, number of moles.

OR you can forget the PV = nRT and use the information from the two gases. I suspect the problem is trying to illustrate Avogadro's Law that equal volumes of gases at the same P and T contain equal number of molecules.

So if 1.5 mol are in the 36.7 L sample and we want to know moles in the 16.5 L sample, we can use the ratio

1.5 mol x (16.5/36.7) = ??

You should get the same answer either way.

## Answer this Question

## Related Questions

- Chemistry - A sample of air contains 78.8% nitrogen, 20.94% oxygen, 0.05% carbon...
- chemistry - 1)A sample of CO2 gas which weighs 0.85 grams has a volume of 1.30 ...
- chemistry - A sample of helium gas has a volume of 325L at 25C and at 5atm. At ...
- chemistry - A sample of helium gas has a volume of 325L at 25C and at 5atm. At ...
- chemistry - A sample of helium gas has a volume of 325L at 25C and at 5atm. At ...
- chemistry - A sample of helium gas has a volume of 325L at 25C and at 5atm. At ...
- chemistry - A sample of helium gas has a volume of 325l at 25c and at 5atm. At ...
- Chemistry UPDATED QUESTION - A sample of air contains 78.08% nitrogen, 20.94% ...
- Chemistry - A sample of air was compressed to a volume of 18.0 L. The ...
- chemistry - A sample of an ideal gas at 1.00 atm and a volume of 1.61 L was ...

More Related Questions