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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 0.9 g of a substance produces an osmotic pressure of 0.246 atm in 0.3 L of solution at 300 K, what is its molar mass? Take R = 0.082 L atm K⁻¹ mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 2.4 g of a substance is dissolved in 200 g of solvent, the boiling point rises by 0.104 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass of the substance?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 4.5 g of a nonelectrolyte is dissolved in 250 g of water, the freezing-point depression is 0.372 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryA solution has an osmotic pressure of 2.46 atm at 300 K and a concentration of 0.1 M. Taking R = 0.082 L atm K⁻¹ mol⁻¹, what is the van’t Hoff factor?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryIn the osmotic-pressure method, if the volume of a solution is halved while the amount of solute and temperature remain unchanged, what happens to the osmotic pressure?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 1 g of a substance is dissolved in 100 g of a solvent, the elevation in boiling point is 0.052 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass of the substance?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 3 g of a nonelectrolyte is dissolved in 500 g of water, ΔTf = 0.186 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryA solution contains 1.8 g of solute dissolved in 200 g of water. If its molality is 0.05 m, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryA 0.6 g sample of a substance produces an osmotic pressure of 0.246 atm in 0.2 L of solution at 300 K. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 2 g of a nonelectrolyte is dissolved in 200 g of solvent, the elevation in boiling point is 0.052 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 1.5 g of a nonelectrolyte is dissolved in 100 g of water, the depression in freezing point is 0.279 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhy can a small error in the temperature difference cause a large error in molar mass determination?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhile calculating molar mass by the osmotic pressure method, if the volume is given as 250 mL, in what form should it be used in the formula?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Easy ChemistryIf the mole fraction of solute is 0.1 and the total number of moles is 2, how many moles of solute are present?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIf the relative lowering of vapour pressure of a solution is 0.05, what is the mole fraction of solute in an ideal dilute solution?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIn the osmotic-pressure method, 1.5 g of solute is present in 500 mL of solution. If T = 300 K, π = 0.738 atm, and R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIf a solute is completely non-dissociating but a student uses i = 2, what will happen to the molar mass calculation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryWhat common principle is used in molar mass determination by both boiling-point elevation and freezing-point depression?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIf the actual molar mass of a solute is 60 g mol⁻¹ but the experimental value is 120 g mol⁻¹, which conclusion is suitable?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIf the actual molar mass of a solute is 180 g mol⁻¹ but the experimental value is 90 g mol⁻¹, which process is possible?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium