Question

Calculate the percent composition by mass of a solution prepared by dissolving 2.68g of CaCl2 in 95.6 g of water.

Answer 1

We want to calculate the percent composition by mass, so we will need two things:

1.) Mass of the solute
2.) Mass of the solvent

Once we identify those, we can find the percentage by dividing the mass of the solute by the mass of the solution (multiplied by 100), which is given by this equation:

\[\% Composition = \frac{mass_{solute}}{mass_{solute} + mass_{solvent}} * 100\]