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?
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%.