PV = nRT
n = m/MW
PV = m/MW*RT
m/V =D = P*MW/(RT)
MW = D*RT/P
MW = (1.21)(0.082)(23.4+273)/1.24 = 23.7167g /mol
A gaseous compound has a density of 1.21 g/L at 23.4 degree C and 1.24 atm....
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