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
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