hotrod1989
May 13, 2009, 09:13 PM
Caculate the number of moles of N2 gas that occupies 3.0 L at STP (standard temperature and pressure)?
Perito
May 14, 2009, 06:24 AM
Standard Temperature and Pressure (STP) is 0 C (273.15 K), and 1 atmosphere.
The ideal gas equation: PV=nRT
Gas constant - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Gas_constant)
R=0.08205746(14) L atm K−1 mol−1
1\,atm \,\times\,3\,L\,=n\,0.082\,\times\,273.15
0.1338\,moles\,\approx\,n
The other way to do this, if you remember that 1 mole of an ideal gas occupies 22.4 L at STP:
n = \frac {3}{22.4} \approx \ 0.1339