Question

4.5 gm of solute having molar mass of 90 gm/mol is dissolved in water to make 250 ml solution. Calculate molarity of the solution

Numerical Value Type

Answer 1

Ans. 0.2 M

Sol. Given -

WT of solute = 4.5g 

molecular mass of solute = 90g

WT of solution = 250ml = 250 x 10^-3 L

Molarity = M = no of moles of solute  ÷ Volume of solution(L)

no of moles of solute = given wt / Molecular mass

n = 4.5/90 = 0.05 moles

M = n / volume

M = 0.05 / 250 x 10^-3

M = 0.05 x 1000 / 250

M = 0.05 x 4 = 0.2M