Question

an aq. solution have a density of 12.5 g/ml . If the molecular weight of solute is 62.5 g/mol . then calculate its molarity?

Answer 1

HELLO THERE!

Density of the solution = 12.5g/mL

Hence, in 1 mL of the solution, 12.5g of the solute is present.

In 1000 mL (1L) of the solution, solute present =

$12.5\times1000 = 12500g$

Molecular mass = 62.5

So, 12500g of the solute is equivalent to

$\frac{12500}{62.5} = 200 moles$ of the solute.

So,

$Molarity = \frac{Moles of solute}{Volume of solution in litres}$

$Molarity = \frac{200}{1} = 200M$

Hence, molarity of the solution is 200M.