What is the mass of solute required to prepare 250 g of a 12% by mass solution?
Mass of solute = (12/100) × 250 = 30 g .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Vapour Pressure and Raoult's Law - Ideal and Non-ideal Solutions
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A solution contains 10% by mass of a solute in water. If 50 g of this solution is taken, what is the mass of the solute?
Mass of solute = (10/100) × 50 = 5 g .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration
What is the mass of water required to prepare 400 g of a 15% by mass solution of a solute?
Mass of solute = (15/100) × 400 = 60 g . Mass of water = 400 - 60 = 340 g .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Colligative Properties - Depression of Freezing Point