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Class 12 · Chemistry
→Under which condition is the observed molar mass of a solute greater than its true molar mass?
Class 12 · Chemistry
→If 25% of the molecules of a substance form dimers, what will be its van’t Hoff factor i?
Class 12 · Chemistry
→The observed molar mass of a substance is 80 g mol⁻¹ and its van’t Hoff factor is 0.8. What is the normal molar mass?
Class 12 · Chemistry
→In molar-mass determination using colligative properties, for which type of solute is the observed molar mass generally lower than its true molar mass?
Class 12 · Chemistry
→For determining the molar mass of a solute in dilute solutions, the osmotic-pressure method is especially suitable for which type of substances?
Class 12 · Chemistry
→If vapour-pressure lowering calculation gives 0.2 mol of solute and the solute mass is 18 g, what is the molar mass?
Class 12 · Chemistry
→If the relative lowering of vapour pressure is 0.02 and the number of moles of solvent is 9.8, approximately how many moles of solute are present in the dilute solution?
Class 11 · Chemistry
→Which condition is most important when determining molar mass from lowering of vapour pressure?
Class 12 · Chemistry
→If a 0.2 m nonelectrolyte solution has Kf = 1.86 K kg mol⁻¹, what is the depression in freezing point?
Class 12 · Chemistry
→A solution contains 2 g of solute in 100 g of solvent. If the molar mass of the solute is 100 g mol⁻¹, what is the molality?
Class 12 · Chemistry
→In the freezing-point-depression method, if the solute mass is doubled while the solvent mass remains constant, what happens to ΔT_f for a nonelectrolyte?
Class 12 · Chemistry
→If 0.5 g of a polymer gives an osmotic pressure of 0.082 atm in 250 mL of solution at 300 K, what is its molar mass? Use R = 0.082 L atm K⁻¹ mol⁻¹.
Class 12 · Chemistry
→If a solution has a van’t Hoff factor i = 1.5 and the normal molar mass is 75 g mol⁻¹, what is the observed molar mass?
Class 12 · Chemistry
→The observed molar mass of a solute in a solution is higher than its normal molar mass. What is the simplest possible reason?
Class 12 · Chemistry
→The observed molar mass of a solute in a solution is lower than its normal molar mass. Which statement best explains this observation?
Class 12 · Chemistry
→A 0.02 mol sample of a substance has a mass of 3.6 g. What is the molar mass of the substance?
Class 12 · Chemistry
→If 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 12 · Chemistry
→When 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 12 · Chemistry
→When 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 12 · Chemistry
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