Calculate the Percent by Mass when 20g of CaCl2 is dissolved in 180 g of solvent.

Sure, here are the steps to calculate the percent by mass:

1. First, you need to find the total mass of the solution. This is done by adding the mass of the solute (CaCl2) to the mass of the solvent. In this case, it would be 20g (CaCl2) + 180g (solvent) = 200g (total mass of solution).

2. Next, you calculate the percent by mass. This is done by dividing the mass of the solute by the total mass of the solution, and then multiplying the result by 100 to get a percentage.

So, the calculation would be: (20g / 200g) * 100 = 10%

Therefore, the percent by mass of CaCl2 in the solution is 10%.