Density of Gases
Q: What is the density of O2 gas at 55.0ºC and 103 kPa?
A: Density is a measure of mass/volume, and mass is interconvertible with moles. So, knowing moles/volume is good enough.
Using the ideal gas law, we know that n/V = P/RT
So n/V = (103 kPa) / [(8.3145 L KPa/mol K)(328 K)] = 0.03777 mol/L
Converting to grams, m = nM = (0.03777 mol/L)(32 g/mol) = 1.209 g/L
A: Density is a measure of mass/volume, and mass is interconvertible with moles. So, knowing moles/volume is good enough.
Using the ideal gas law, we know that n/V = P/RT
So n/V = (103 kPa) / [(8.3145 L KPa/mol K)(328 K)] = 0.03777 mol/L
Converting to grams, m = nM = (0.03777 mol/L)(32 g/mol) = 1.209 g/L
