30g of urea is dissolved in sufficient water to produce 2L of solution, calculate % w/v and morality
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mass of solution = 100 gm
mass of urea in the solution= 30 gm
mass of h20 in the solution = 100- 30 = 70 gm
1) w/ v% =mass of solute ( urea) / volume of solution ×100
= 30gm /(2×1000) ml ×100
= 1.5 gm ml^-1
2) molarity = no of moles of solute / volume of solution
no of moles of urea = 30 /60 = 1/2
molarity = 1/2 /2 = 1/4 = 0.25
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