#solute

Vapour Pressure and Raoult's Law - Ideal and Non-ideal Solutions

A solution lowers the vapor pressure of a solvent from 32 mm Hg to 30 mm Hg. What is the mole fraction of the solute?

(p⁰ - p/p⁰) = xsolute . (32 - 30/32) = (2/32) = 0.0625 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Vapour Pressure and Raoult's Law - Ideal and Non-ideal Solutions

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Types of Solutions and Expressing Concentration

What is the mass percentage of a solution if 5 g of a solute is dissolved in 45 g of water?

Total mass = 5 g + 45 g = 50 g. Mass % = (5/50) × 100 = 10% .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

A solution reduces the vapor pressure of a solvent from 35 mm Hg to 33 mm Hg. What is the mole fraction of the solute?

(p⁰ - p/p⁰) = xsolute . (35 - 33/35) = (2/35) ≈ 0.0571 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

What is the mole fraction of a solute if the vapor pressure of a solution is 27 mm Hg and that of pure solvent is 30 mm

(p⁰ - p/p⁰) = xsolute . (30 - 27/30) = (3/30) = 0.1 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

A solution lowers the vapor pressure of a solvent from 40 mm Hg to 38 mm Hg. What is the mole fraction of the solute?

(p⁰ - p/p⁰) = xsolute . (40 - 38/40) = (2/40) = 0.05 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

A solution reduces the vapor pressure of a solvent from 28 mm Hg to 26 mm Hg. What is the mole fraction of the solute?

(p⁰ - p/p⁰) = xsolute . (28 - 26/28) = (2/28) ≈ 0.0714 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

What is the mole fraction of a solute if the vapor pressure of a solution is 23 mm Hg and that of pure solvent is 25 mm

(p⁰ - p/p⁰) = xsolute . (25 - 23/25) = (2/25) = 0.08 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

What is the mole fraction of a solute if the vapor pressure of a solution is 28 mm Hg and that of pure solvent is 30 mm

(p⁰ - p/p⁰) = xsolute . (30 - 28/30) = (2/30) ≈ 0.0667 .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

What is the mass percentage of a solution if 20 g of a solute is dissolved in 180 g of water?

Total mass = 20 + 180 = 200 g . Mass % = (20/200) × 100 = 10% .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Types of Solutions and Expressing Concentration

A solution contains 10 g of a solute in 90 g of water. What is the mass percentage of the solute?

Total mass = 10 g + 90 g = 100 g. Mass % = (10/100) × 100 = 10% .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Types of Solutions and Expressing Concentration

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Solubility - of Solids and Gases in Liquids Henry's Law

A solution is made by dissolving 20 g of a solute in 80 g of water. If the mass percentage of the solute is doubled in a

Initial mass % = (20/20 + 80) × 100 = 20% . New mass % = 40% = (20/20 + w) × 100 . 0.4 (20 + w) = 20 , 20 + w = 50 , w = 30 g .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Solubility - of Solids and Gases in Liquids Henry's Law

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Colligative Properties - Osmotic Pressure and Reverse Osmosis

What is the molar mass of a solute if 3 g of it in 200 mL of solution produces an osmotic pressure of 0.738 atm at 27°C?

Pi = (w/M V) RT . 0.738 = (3/M × 0.2) × 0.0821 × 300 . M = (3 × 0.0821 × 300/0.738 × 0.2) ≈ 50 g/mol .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Colligative Properties - Osmotic Pressure and Reverse Osmosis

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