Recall that
PV=nRT
n=(P/RT)V
so at constant temperature and pressure the moles of gas are proportional to volume.
R = 0.0821 L·atm/mol·K
So if we have P in atmospheres and T in kelvins we can calculate moles from volume or volume from moles. Note that it doesn't matter what kind of gas we have. The number of particles is all that counts. Only the density in g/L will depend on the molar mass of what the gas is made from. All the calculations in this section can be made using this information.
You should review the gas law conversions from Unit G.
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