A single-stage batch still operating at 760 mm Hg pressure is charged with 75 mol of a 82 mol% methanol(1)/18 mol% water(2) mixture. Assume the mixture is an ideal solution.

How much distillate will be collected if the average distillate concentration desired is 90.0%?

How many moles will remain in the still and what is its methanol concentration?

The Antione equations (where \(T\) is in Celsius) are:

Methanol: \(log_{10}P_1^{sat}\,=\,8.081-\left(\frac{1582}{T+239.7}\right)\)

Water: \(log_{10}P_2^{sat}\,=\,8.071-\left(\frac{1731}{T+233.4}\right)\)