How many moles of potassium chloride, kcl, are needed to make 100.0 ml of a 2.0 m kcl solution?

0.20 Moles

Solution:

Data Given:

Molarity = 2.0 mol. L⁻¹

M. Mass = 74.55 g. mol⁻¹

Volume = 100 mL = 0.1 L

Formula Use:

Molarity = Moles : Volume

Solving for Moles,

Moles = Molarity * Volume

Putting values,

Moles = 2.0 mol. L⁻¹ * 0.1 L

Moles = 0.20 mol

Preparation of 2 M KCl Solution:

Take 0.2 moles of KCl and pour it into a 100 mL empty volumetric flask. After that add distilled water upto the mark of 100 mL. The concentration of resulting solution will be 2.0 M.