How do you find density in the ideal gas law?

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Jun 29, 2014

The density is determined by utilizing a variation of the ideal gas law where density and molar mass replace moles and volume.

The original ideal gas law uses the formula PV = nRT, the density version of the ideal gas law is PM = dRT, where P is pressure measured in atmospheres (atm), T is temperature measured in kelvin (K), R is the ideal gas law constant 0.0821 #(atm(L))/(mol(K))# just as in the original formula, but M is now the molar mass (#g/(mol)#) and d is the density (#g/L#).

By rearranging the formula to #(PM)/(RT) = d# the units of atm, mol and K will cancel and the value will be left with the #g/L# units for density.

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