You need to dissolve cacl2 in water to make a mixture that is 40.0% calcium chloride by mass. if the total mass of the mixture is 370.9g, what masses of cacl2 and water should be used? .

Mass of and water to be used is 148.4 g and 222.5 g respectively.

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

Given : mass percent of calcium chloride = 40.0 %

Mass of mixture (calcium chloride + water) = 370.9 g

Putting in the values we get:

Mass of calcium chloride + mass of water = 370.9

Mass of water = 370.9 g- 148.4 g = 222.5 g

Thus mass of and water to be used is 148.4 g and 222.5 g respectively.