We are being asked to find the concentration of CaCl_{2} (in % by mass) in the solution prepared.

**Mass** or **weight percent (% by mass) **is the percentage of a given element or compound within a solution.

The equation used to calculate for mass percent is shown below:

$\overline{){\mathbf{m}}{\mathbf{a}}{\mathbf{s}}{\mathbf{s}}{\mathbf{}}{\mathbf{p}}{\mathbf{e}}{\mathbf{r}}{\mathbf{c}}{\mathbf{e}}{\mathbf{n}}{\mathbf{t}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{m}\mathbf{p}\mathbf{o}\mathbf{n}\mathbf{e}\mathbf{n}\mathbf{t}}{\mathbf{t}\mathbf{o}\mathbf{t}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}{\mathbf{\times}}{\mathbf{100}}}$

A solution is prepared by dissolving 23.7 g of CaCl _{2} in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of CaCl_{2} is __________ % by mass.

a) 0.0632

b) 6.32

c) 6.24

d) 5.94

e) 0.0594

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Based on our data, we think this problem is relevant for Professor Shafaat's class at OSU.