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Class 12 · Chemistry
→If 0.3 g of a solute in 150 mL of solution gives an osmotic pressure of 0.123 atm at 300 K, and i = 1, what is the molar mass?
Class 12 · Chemistry
→A solute of concentration 0.02 M has an osmotic pressure of 0.984 atm at 300 K. If R = 0.082 L atm mol⁻¹ K⁻¹, what is the van’t Hoff factor (i), and what does it indicate about the solute’s behaviour?
Class 12 · Chemistry
→A solute forms trimers to the extent of 60%. If its true molar mass is 180 g mol⁻¹, what will be its observed molar mass?
Class 12 · Chemistry
→An AB₂ solute has a true molar mass of 180 g mol⁻¹ and is 70% dissociated. What is its approximate observed molar mass?
Class 12 · Chemistry
→A solute has a van’t Hoff factor i = 2.25 and an observed molar mass of 64 g mol⁻¹. What is its true molar mass?
Class 12 · Chemistry
→When 4 g of a non-volatile solute is dissolved in 36 g of water, the relative lowering of vapour pressure is 0.08. What is the approximate molar mass of the solute?
Class 12 · Chemistry
→When 4.5 g of a solute is dissolved in 300 g of water, the depression in freezing point is 0.837 K. If i = 1.5, what is the true molar mass?
Class 12 · Chemistry
→If K_b = 0.52 K kg mol⁻¹, the solute mass is 3 g, the solvent mass is 250 g, the molar mass of the solute is 60 g mol⁻¹, and the van’t Hoff factor i = 2, what is the elevation in boiling point, ΔT_b?
Class 12 · Chemistry
→If K_f = 1.86 K kg mol⁻¹, the solute mass is 4 g, the solvent mass is 200 g, the molar mass of the solute is 100 g mol⁻¹, and the van’t Hoff factor i = 1.5, what is the depression in freezing point, ΔT_f?
Class 12 · Chemistry
→A 300 mL solution is prepared using 1.8 g of solute. At 300 K, its osmotic pressure is 0.492 atm. If i = 1.2, what is the true molar mass? Use R = 0.082 L atm K⁻¹ mol⁻¹.
Class 12 · Chemistry
→When 1.5 g of a solute is dissolved in 100 g of water, the depression in freezing point is 0.186 K. If i = 0.75, what is the true molar mass?
Class 12 · Chemistry
→If the true molar mass of a solute is 240 g mol⁻¹ and the colligative method gives an observed molar mass of 160 g mol⁻¹, what are i and the probable behaviour of the solute?
Class 12 · Chemistry
→When 2 g of a solute is dissolved in 0.4 kg of solvent, the effective molality is 0.10 m. If i = 0.5, what is the true molar mass?
Class 12 · Chemistry
→If a 0.3 m solution has i = 0.6, what molality would appear from a colligative property if the van’t Hoff factor correction were ignored?
Class 12 · Chemistry
→When 5 g of a solute is dissolved in 500 g of solvent, the elevation in boiling point is 0.078 K. If Kb = 0.52 K kg mol⁻¹ and i = 1.5, what is the true molar mass?
Class 12 · Chemistry
→When 3 g of a solute is dissolved in 250 g of water, the depression in freezing point is 0.465 K. If the van’t Hoff factor is 1.5, what is the true molar mass?
Class 12 · Chemistry
→A solution contains 2.4 g of solute in 400 mL of solution. Its osmotic pressure at 300 K is 0.492 atm. If i = 0.8, what is the true molar mass?
Class 12 · Chemistry
→If the true molar mass of a solute is 180 g mol⁻¹ and 30% dimerization occurs, what will be the approximate observed molar mass?
Class 12 · Chemistry
→A solute has an observed molar mass of 72 g mol⁻¹. If it is of A₂B type and is 40% dissociated, what is its true molar mass?
Class 12 · Chemistry
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