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

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.

Ithink its solid. hope this