Question

An aqueous solution have a density of 1.25g/ml..If molecular weight of solute is 62.5g/mol. Then calculate molarity of solution? Please explain your answer....
(1) 2M (2) 5M (3) 50M (4) 20 M
Answer is 20M How calculate and show?

Answer 1

Here's Ur answer..
Hope it helps..

Answer 2

Answer : (4) The Molarity of solution is 20 M.

Solution : Given,

Density of solution = 1.25 g/ml

Molecular weight of solute = 62.5 g/mole

Formula used :

$Molarity=\frac{\text{ weigth of solute}}{\text{ Molecular weight of solute}\times \text{ Volume of solution}}$

As we know that  $Density=\frac{Mass}{Volume}$

By rearranging the above formula, we get

$Molarity=\frac{\text{ Density of solution}}{\text{ Molecular weight of solute}}$

$Molarity=\frac{1.25g/ml}{62.5g/mole}=0.02mole/ml=0.02mole/ml=20mole/L=20M$   (1 L = 1000 ml)

Therefore, the Molarity of solution is 20M.