14 public questions tagged with this topic.
Δ Tb = Kb · m . 100.39 - 100 = 0.39 . 0.39 = Kb × 0.75 . Kb = (0.39/0.75) = 0.52 K kg mol⁻¹ .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Vapour Pressure and Raoult's Law - Ideal and Non-ideal Solutions
Moles = 72 / 18 = 4 mol . For vaporization, Δ Ssys = n × Δ Hvap / T = 4 × 40790 / 373 ≈ 437.48 J/K ≈ 437.5 J/K .
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Gibbs Energy and Gibbs Energy Change and Equilibrium
Moles = 54 / 18 = 3 mol, Δ T = 80 - 20 = 60 K, qp = nCpΔ T = 3 × 75.3 × 60 = 13554 J = 13.55 kJ.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Gibbs Energy and Gibbs Energy Change and Equilibrium
q = m × C × Δ T = 40 × 4.18 × 10 = 1672 J = 1.672 kJ.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: First Law of Thermodynamics and Enthalpy and Internal Energy
Moles = 18 / 18 = 1 mol, Δ S = Δ Hvap / T = 40.79 × 10³ / 373 = 109.36 J/K·mol.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Bond Enthalpy and Entropy and Spontaneity
For H₂O(l) → H₂O(g) at 373 K, Δ Ssys = (Δ Hvap/T) = (40.79 × 10³/373) = 109.4 J/K , representing the entropy increase due to phase change from liquid to gas.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Bond Enthalpy and Entropy and Spontaneity
Moles of C₆H₁₂O₆ = 18/180 = 0.1 mol; moles of H₂O = 4 mol. Total moles = 4.1. Mole fraction = 0.1/4.1 ≈ 0.0244.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
Moles of NaCl = 0.1 mol. Moles of H₂O = 5 mol. Total moles = 5.1; mole fraction = 0.1/5.1 ≈ 0.0196.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
Moles of CH₃OH = 0.5 mol; moles of H₂O = 2 mol. Total moles = 2.5. Mole fraction = 0.5/2.5 = 0.2.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
Moles of H₂O = 0.5 mol; moles of C₂H₅OH = 0.5 mol. Total moles = 1. Mole fraction = 0.5.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
Water splits during photolysis in the light-dependent reaction, providing electrons to Photosystem II.
Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Light Reaction - Photosystems Electron Transport Photophosphorylation
Carbonic anhydrase catalyzes the conversion of carbon dioxide and water into carbonic acid.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzymes - Properties Classification and Cofactors
