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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

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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

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