percent by mass and percent by volume

Question

A solution is formed by adding 50 g of potassium chloride to 450 g of water. What is the percent by mass of potassium chloride?

Answer 1

So, percent by mass means mass of substance divided by total mass (x100%).

mass of substance = 50 g KCl

mass of water = 450 g

Total mass = 50 g + 450 g = 500 g

Percent KCl by mass = 50 g / 500 g (x100%) = 10%