The molecular weight of Potassium chloride KCl is 7455 gmol

The molecular weight of Potassium chloride (KCl) is 74.55 g/mol. How many grams would you need for 800 ml of a 55 mM solution?

Solution

Answer:-

Potassium Chloride (KCl) = 74.55 g/mol

Volume = 800 mL

Molarity (M) = 55 mM

= 0.055 M

M = w x 1000/(MW x Volume(ml))

w = 0.055 x 74.55 x 800/1000

= 3.2802 g

= 3.28 g