Question

A sample of potassium chloride has a concentration of 10 g/dm3. What mass of potassium chloride is dissolved in 400 cm3 of water?

Answer 1

Answer:

25g

Explanation:

1 decimeter cube=1000cm cube

so

in dm3,10g of KCl is dissolved.

which means that 10g of KCl is dissolved in 1000cm3.

so we can convert 400 cm3 to 0.4 dm3

As

CONCENTRATION = MASS ÷ VOLUME

10 = mass ÷ 0.4

mass = 10 ÷ 0.4

which is

25.

So 25 g of KCl dissolves in 400 cm3 of water