A student dissolves 20g of potassium chloride in 100cm³ of water in a beaker. What is the concentration of the solution in g/dm³?

The concentration of the solution is 2 g/dm³

Explanation:

The equation used to find the concentration of a solution is "c = m/v"

C = concentration

M = mass

V = volume

The question asks for the answer to be in decimeters, so you need to 100 cm³ to dm³. To do this, you divide 100 by 10, giving you 10 cm³. Then you just plug in your numbers into the formula: c = 20g/10dm³.