Question

What mass of KMnO4 should you use to prepare 1 litre of a 3g/L

Answer 1

Given values:

Molarity=1.5

Volume of solution=1 L

Lets find No of moles of KMnO₄:

1.5= No of moles of KMnO₄/1

No of moles=1.5

Moles=given mass/Molar mass

Molar mass of KMNO₄=158

Here we need to find the given mass

1.5=given mass/158

given mass=1.5×158

                  =237g

Hence we require 237 g of KMnO₄ to make a solution of 1.5 M