Question

You make a solution by dissolving 2.45 g of KCl in 20.6 ml of water. What is the percent by mass of KCl in this solution?

Answer 1

To find the percent by mass of KCl in the solution, we need to first calculate the total mass of the solution.

Mass of KCl = 2.45 g
Mass of water = 20.6 ml x 1 g/ml = 20.6 g

Total mass of the solution = 2.45 g + 20.6 g = 23.05 g

Now, we can calculate the percent by mass of KCl in the solution:

Percent by mass of KCl = (mass of KCl / total mass of solution) x 100
= (2.45 g / 23.05 g) x 100
= 10.63%

Therefore, the percent by mass of KCl in this solution is 10.63%.