Question

If a saturated solution of KCl containing 20g of water is cooled from 90 to 40 degrees Celsius. What mass of the solute will crystallize

Answer 1

Do you have the solubility of KCl @ 40 C? and 90 C? You must have a graph or a table that lists those values. You may be able to find them on the web. Post them when you have that information.