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Class 12 · Chemistry
→The 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 12 · Chemistry
→In 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 12 · Chemistry
→A 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 12 · Chemistry
→When 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 12 · Chemistry
→Which statement is most correct in molar-mass determination when a solute dissociates or associates?
Class 12 · Chemistry
→A 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 12 · Chemistry
→If 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 12 · Chemistry
→When 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 12 · Chemistry
→If 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 12 · Chemistry
→An 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 12 · Chemistry
→If 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 12 · Chemistry
→A 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 12 · Chemistry
→A 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 12 · Chemistry
→An AB₂ solute has a true molar mass of 120 g mol⁻¹ and is 80% dissociated. What will be its observed molar mass?
Class 12 · Chemistry
→A 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 12 · Chemistry
→When 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 12 · Chemistry
→When 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 12 · Chemistry
→For 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 12 · Chemistry
→For 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 12 · Chemistry
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