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Moles = 5.6/22.4 = 0.25 mol. Molar mass = 2/0.25 = 8 g/mol.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Reaction: 2C₃H₆ + 9O₂ → 6CO₂ + 6H₂O. Moles of C₃H₆ ≈ 0.1857 mol. 2 mol need 9 mol O₂; 0.1857 mol need ≈ 0.8357 mol. Volume = 0.8357 × 22.4 ≈ 18.72 L.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Mass of 1 L solution = 1000 × 1.03 = 1030 g. Mass of H₂SO₄ = 0.5 × 98 = 49 g. Mass of water = 981 g = 0.981 kg. Molality = 0.5 / 0.981 ≈ 0.51 m.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Reaction: K₂CO₃ + 2HCl → 2KCl + CO₂ + H₂O. Moles of KCl ≈ 0.1852 mol. 2 mol KCl from 1 mol K₂CO₃; 0.1852 mol from 0.0926 mol. Mass ≈ 12.78 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Total mass = 10.1 + 39.9 = 50 g. Mass % = (10.1/50) × 100 = 20.2%.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Moles of HCl = 14.6/36.5 = 0.4 mol. Volume = 0.4 L. Molarity = 0.4/0.4 = 1 M.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Reaction: 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O. Moles of NaOH = 8/40 = 0.2 mol. 2 mol NaOH produce 1 mol Na₂SO₄; 0.2 mol produce 0.1 mol. Mass = 0.1 × 142 = 14.2 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Moles = 1.12/22.4 = 0.05 mol. Molar mass = 1.6/0.05 = 32 g/mol.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Total mass = 7.45 + 42.55 = 50 g. Mass % = (7.45/50) × 100 = 14.9%.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Moles = 1.12/22.4 = 0.05 mol. Molar mass = 1.4/0.05 = 28 g/mol.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Moles of Zn = 6.5/65 = 0.1 mol. 1 mol Zn from 1 mol ZnSO₄; mass = 0.1 × 161.5 = 16.15 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Reaction: CH₄ + 2O₂ → CO₂ + 2H₂O. Moles: CH₄ = 0.5 mol, O₂ = 1 mol. 0.5 mol CH₄ needs 1 mol O₂ (available). 0.5 mol CO₂ formed = 0.5 × 44 = 22 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
