Calculate the critical density of methyl alcohol?

Calculate the critical density of methyl alcohol from the following data:
ρ -------- d liq. (g/cc) ------ d vap. (g/cc)
13.57 ------ 0.6495 ----------- 0.01562
61.25 ------ 0.4675 ----------- 0.1003
The critical temperature is 240 C.

Answer:
Are the numbers in the first column temperatures?
Are all the data given at 1 atm?

If so, fit each set of data to an equation...
For liquids, this is rho=A(1-T/Tcrit)^D, T and Tcrit should be in kelvins, rho should be in mol/L (you can convert back later).

For gases, the van der Waals eq. is good for this.
P=RT/(1/rho-b)-a(rho)^2

(Answer given by ideal gas law can have error >100%, but it's always a good rough estimate).
Use P = dRT

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