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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।

ChemistryWhen 2.4 g of a solute is dissolved in 200 g of solvent, the elevation in boiling point is 0.156 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 17HardChemistryA 500 mL solution is prepared using 2 g of solute. At 300 K, its osmotic pressure is 0.615 atm. If i = 1.25, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryWhen 3.6 g of an AB solute is dissolved in 300 g of water, the depression in freezing point is 0.558 K. If the degree of dissociation is 25%, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistry3 g of a non-volatile solute is dissolved in 72 g of water. The relative lowering of vapour pressure is 0.04. What is the approximate molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryWhen 4.8 g of a solute is dissolved in 400 g of solvent, the elevation in boiling point is 0.156 K. If Kb = 0.52 K kg mol⁻¹ and i = 0.75, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryWhen 2.5 g of a solute is dissolved in 500 g of water, the depression in freezing point is 0.2325 K. If the van’t Hoff factor is 1.25, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryA student mistakenly uses 0.125 g instead of 125 g for the solvent mass in a freezing-point method. How will the calculated molar mass compare with the correct value?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryA 0.04 M solution has an osmotic pressure of 1.476 atm at 300 K. If the true molar mass is 150 g mol⁻¹, what will be the observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryAn AB₃-type solute is 40% dissociated. If its observed molar mass is 62.5 g mol⁻¹, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryA solute forms dimers. Its true molar mass is 120 g mol⁻¹ and its observed molar mass is 150 g mol⁻¹. What is the degree of association?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryThe true molar mass of MgCl₂ is 95 g mol⁻¹. If its observed molar mass from a colligative-property method is 47.5 g mol⁻¹, what is the degree of dissociation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryIn the vapour-pressure method, the mole fraction of a solute is 0.05. If 2.0 g of solute is dissolved in 18 g of water, what is the approximate molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryA 250 mL solution is prepared from 3.0 g of a solute. At 300 K, its osmotic pressure is 0.738 atm. If the solute has i = 0.75, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryWhen 4.0 g of an AB₂-type solute is dissolved in 200 g of water, the freezing-point depression is 0.744 K. If dissociation is 50% and Kf = 1.86 K kg mol⁻¹, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryWhich statement is most correct in molar-mass determination when a solute dissociates or associates?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryA 1 L solution is prepared from 2.0 g of a solute. At 300 K, its osmotic pressure is 0.164 atm. If the solute forms dimers to the extent of 50%, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryIf an AB₂ solute has a van’t Hoff factor of 2.2 and a true molar mass of 132 g mol⁻¹, what are its observed molar mass and degree of dissociation, respectively?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryWhen 1.0 g solute is dissolved in 500 g water, the freezing-point depression is 0.0186 K. If i = 1, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryIf a solute has i = 0.6 and a true molar mass of 90 g mol⁻¹, what will be the observed molar mass from a colligative method?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryAn AB solute has a van’t Hoff factor of 1.4 and an observed molar mass of 75 g mol⁻¹. What are its true molar mass and degree of dissociation, respectively?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium