5.What is the percent by mass of a solution 2.67 Molar of CaSO4, if the density of the solution is 1.95 g/ml?
Answer:
You might want to make a note to ask your teacher about solubility rules. CaSO4 is fairly insoluble in water, and you could not make a 2.67 molar solution of it!
Anyway, 2.67 molar means 2.67 moles of CaSO4 dissolved in 1 liter of solution.
1 liter of solution = 1000 mL
1000 mL x 1.95 g/mL = 1950 grams
2.67 moles CaSO4 x (136 g/mol) = 363 grams
Percent by mass would be (363/1950) or 18.6 %
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