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Ideal Gases

Caculate the number of moles of N2 gas that occupies 3.0 L at STP (standard temperature and pressure)?

6.023

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

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:

$n = \frac {3}{22.4} \approx \ 0.1339$

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