Homework #7

[206190205]

A solution of CaCl2 in water forms a mixture that is 38.5% calcium chloride by mass. If the total mass of the mixture is 424.1g, what masses of CaCl2 and water were used?

I was trying to do cross multiplication and did the x/35.8% by 424.1/100% and I got the wrong answer. Am I supposed to change the percent to a decimal, or what am I doing wrong?

[Lucas Vu 2G]

To answer this question I would start by converting the percentage mass of CaCl₂ into mass in grams. This can be done by taking the given 38.5% of the given total mass of 424.1g (0.385 * 424.1). With the number of grams of Calcium Chloride in the total mixture, you can determine the amount of grams of water by subtracting the calculated mass of Calcium Chloride by the total number of grams.