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Molar Mass Determination

Class 12 Chemistry के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ChemistryIf 0.2 g solute in 100 mL solution gives an osmotic pressure of 0.123 atm at 300 K and i = 1, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryA 0.01 M solute has an osmotic pressure of 0.369 atm at 300 K. If R = 0.082 L atm mol⁻¹ K⁻¹, what are i and the likely behaviour of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryA solute forms trimers to the extent of 25%. If its true molar mass is 150 g mol⁻¹, what will be the approximate observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryAn AB₂ solute has a true molar mass of 120 g mol⁻¹ and is 80% dissociated. What will be its observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA solute has van’t Hoff factor i = 2.4 and an observed molar mass of 50 g mol⁻¹. What is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryWhen 5 g of a non-volatile solute is dissolved in 45 g water, the relative lowering of vapour pressure is 0.10. What is the approximate molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 3.0 g of a solute is dissolved in 200 g of water, the depression in freezing point is 0.558 K. If the van’t Hoff factor is 1.2, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryFor a non-dissociated solute, K_b = 0.52 K kg mol⁻¹, the solute mass is 1.2 g, the solvent mass is 100 g, and the molar mass is 60 g mol⁻¹. What is the elevation in boiling point, ΔT_b?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Easy ChemistryFor a non-dissociated solute, K_f = 1.86 K kg mol⁻¹, the solute mass is 2.5 g, the solvent mass is 250 g, and the molar mass is 100 g mol⁻¹. What is the depression in freezing point, ΔT_f?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Easy ChemistryA 500 mL solution is prepared from 4.5 g of solute. At 300 K, its osmotic pressure is 0.738 atm. If the van’t Hoff factor is 1.2, what is the true molar mass? Use R = 0.082 L atm K⁻¹ mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 2.0 g of a solute is dissolved in 100 g of water, the depression in freezing point is 0.186 K. If the van’t Hoff factor is 0.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryThe true molar mass of a solute is 150 g mol⁻¹, but its molar mass determined by a colligative-property method is 100 g mol⁻¹. What is the van’t Hoff factor, and what is the probable behaviour of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryWhen 1.5 g of a solute is dissolved in 0.3 kg of solvent, the observed (effective) molality is 0.05 mol kg⁻¹. If the solute has a van’t Hoff factor of 0.75, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryWhen 3.6 g of a solute is dissolved in 400 g of solvent, the elevation in boiling point is 0.117 K. If Kb = 0.52 K kg mol⁻¹ and i = 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 2.5 g of a solute is dissolved in 200 g of water, the depression in freezing point is 0.465 K. If the van’t Hoff factor is 1.25, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA solution contains 3.0 g of solute in 600 mL of solution. Its osmotic pressure at 300 K is 0.615 atm. If the van’t Hoff factor is i = 0.75, what is the true molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryIf the true molar mass of a solute is 200 g mol⁻¹ and 20% dimerization occurs, what will be its approximate observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA solute has an observed molar mass of 64 g mol⁻¹. If it is an AB₂-type electrolyte and is 25% dissociated, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryIn the vapour-pressure method, p⁰ = 100 mm Hg and p = 96 mm Hg. If 2 g of a non-volatile solute is dissolved in 36 g of water, what is the approximate molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryCaCl₂ is 75% dissociated in solution. If its observed molar mass is 44.4 g mol⁻¹, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard