20 gm. of a solution saturated with a salt at 80°C is cooled to 30°C. How much of the salt will crystallize out of the solution if its solubility at 80 and 30 degree Celsius are 100 and 25 respectively?
a. 5 gm.
b. 7 gm.
c. 7.5 gm.
d. 8.5 gm.
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