Problem: The density of a gas of unknown molar mass was measured as a function of pressure at 0 oC, as in the table below. Pressure (atm)1.000.6660.5000.3330.250 Density  (g/L) 2.30741.52631.14010.75710.5660Determine a precise molar mass for the gas. Hint: Graph d / P versus P.

FREE Expert Solution

We’re being asked to calculate for the molar mass of a gas using the plot of density and pressure


Recall that to calculate using density, we can use the ideal gas equation.

PV=nRT


PVV=nRTV

P=nRTV

n=mass mmolar mass (M)

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Problem Details
The density of a gas of unknown molar mass was measured as a function of pressure at 0 oC, as in the table below.


 Pressure 




(atm)1.000.6660.5000.3330.250
 Density 




 (g/L2.30741.52631.14010.75710.5660


Determine a precise molar mass for the gas. Hint: Graph d / P versus P.

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Our tutors have indicated that to solve this problem you will need to apply the Ideal Gas Law Density concept. If you need more Ideal Gas Law Density practice, you can also practice Ideal Gas Law Density practice problems.