If the density of an unknown gas Z 4.50 g/L at STP, what is the molar mass of gas Z?

1 Answer
May 17, 2016

P.MM=d.R.T

Explanation:

Use the ideal gas equation

P.V=n.R.T

P.V=mMM.R.T

P.MM=mV.R.T

P.MM=d.R.T

P is the pressure of the gas (atm)
MM is the molar mass (g.mol1)
d is the density of the gas (g.L1)
R is the universal gas constant (0.0821L.atm.mol1.K1)

Solve for MM

MM=d.R.TP

MM=4.50gL10.0821Latmmol1K1273K1.00atm

MM101 g.mol1