7 public questions tagged with this topic.
Mass of H = (2/18) × 0.135 = 0.015 g. Percentage = (0.015/0.15) × 100 = 10%.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism
For 100 g: C = 26.67 g, H = 2.22 g, O = 71.11 g. Moles: C ≈ 2.22, H = 2.22, O ≈ 4.44. Ratio = 1 : 1 : 2; empirical formula = CHO₂, mass = 45 g/mol. n = 90/45 = 2; molecular formula = C₂H₂O₄.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Mole Concept and Molar Masses and Percentage Composition
For 100 g: C = 40 g, H = 6.67 g, O = 53.33 g. Moles: C ≈ 3.33, H ≈ 6.67, O ≈ 3.33. Ratio = 1 : 2 : 1; empirical formula = CH₂O, mass = 30 g/mol. n = 180/30 = 6; molecular formula = C₆H₁₂O₆.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Mole Concept and Molar Masses and Percentage Composition
For 100 g: C = 36.36 g, H = 6.06 g, O = 57.58 g. Moles: C ≈ 3.03, H ≈ 6.06, O ≈ 3.6. Ratio ≈ 1 : 2 : 1; empirical formula = CH₂O.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
For 100 g: Na = 32.43 g, S = 22.52 g, O = 45.05 g. Moles: Na ≈ 1.41, S ≈ 0.704, O ≈ 2.82. Ratio = 2 : 1 : 4; empirical formula = Na₂SO₄.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
For 100 g: C = 52.17 g, H = 13.04 g, O = 34.78 g. Moles: C ≈ 4.35, H ≈ 13.04, O ≈ 2.17. Divide by smallest (2.17): C ≈ 2.00, H ≈ 6.00, O = 1.00. Ratio = 2:6:1; empirical formula = C₂H₆O.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
5% accurately defines or describes the concept asked in this question. Within Water and Mole Concept, precise definitions and terminology are essential for clear scientific communication. The other options (0.5%, 10%, and 20%) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
