science

You really can't say without knowing some data---the mere fact that a low boiling azeotrope exists indicates that the mixture is not ideal--so you can't make any general prediction of vapor liquid equilibrium. So IMHO I'd start doing some research on equilibrium liquid/vapor concentrations.

Now I may be showing my age, but I'd start with the CRC Handbook of Chemistry and Physics, but I'm sure there are many online references can be found for this information.

Rap