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?

In order to calculate for the amount of CaCl2 and water used we need to multiply the total amount mixture to the percentage of each component. Since we are given a two component mixture CaCl2-water with 40% CaCl2 by mass, therefore we have 60% water.

Amount of CaCl2 = 0.40*(370.9) =148.36 g of CaCl2 
Amount of Water = 0.60*(370.9) = 222.54 g of Water

The flowers in a flower arrangement are actually alive

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .