How many distillations would it take to obtain greater than 90% purity of compound A, if you started with a binary mixture that was a 10% mole ratio of compound A and 90% mole ratio of compound B

In one or two grammatically correct sentences, write a definition for the term molecule geometry

A0.10 m aqueous solution of sodium sulfate is a better conductor of electricity than a 0.10 m aqueous solution of sodium chloride. which of the following best explains this observation? (a) sodium sulfate is more soluble in water than sodium chloride. (b) sodium sulfate has a higher molar mass than sodium chloride. (c) to prepare a given volume of 0.10 m solution, the mass of sodium sulfate needed is more than twice the mass of sodium chloride needed. (d) more moles of ions are present in a given volume of 0.10 m sodium sulfate than in the same volume of 0.10 m sodium chloride. (e) the degree of dissociation of sodium sulfate in solution is significantly greater than that of sodium chloride.

There was a water with a boat and a rock in a boat. will the level of the water stay the same or higher or lower if u remove the rock from the boat and put it under water? ?