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Class 12 · Chemistry
→A salt of type A₂B is 40% dissociated. Its normal molar mass is 150 g mol⁻¹. What will be its observed molar mass?
Class 12 · Chemistry
→A polymer solution contains 0.2 g polymer in 200 mL solution. At 300 K, its osmotic pressure is 0.0205 atm. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass of the polymer?
Class 12 · Chemistry
→A solution contains 1.5 g solute dissolved in 0.25 kg solvent. If its molality is 0.06 m, what is the molar mass of the solute?
Class 12 · Chemistry
→In the vapour-pressure-lowering method, 1.8 g of a solute is dissolved in 9.0 g water. The relative lowering of vapour pressure is 0.10. If the molar mass of water is 18 g mol⁻¹, what is the approximate molar mass of the solute?
Class 12 · Chemistry
→A 1.0 g sample of an AB-type salt dissolved in 100 g water gives ΔT_f = 0.372 K. If K_f = 1.86 K kg mol⁻¹ and the normal molar mass is 100 g mol⁻¹, what is the degree of dissociation?
Class 12 · Chemistry
→A 0.5 g solute dissolved in 100 g water gives ΔT_f = 0.093 K. If K_f = 1.86 K kg mol⁻¹ and the solute undergoes 50% dimer association, what is its normal molar mass?
Class 12 · Chemistry
→A 250 mL solution is prepared using 0.25 g of a polymer. Its osmotic pressure at 300 K is 0.041 atm. If R = 0.082 L atm K−1 mol−1, what is the molar mass of the polymer?
Class 12 · Chemistry
→A 2.5 g solute dissolved in 125 g of solvent produces a boiling-point elevation of 0.26 K. If Kb = 0.52 K kg mol−1, what is the molar mass of the solute?
Class 12 · Chemistry
→When 1.8 g of a nonelectrolyte is dissolved in 150 g of solvent, the depression in freezing point is 0.372 K. For the solvent, Kf = 1.86 K kg mol−1. What is the molar mass of the solute?
Class 12 · Chemistry
→If 60% of the molecules of a substance form trimers and its normal molar mass is 90 g mol−1, what will be the observed molar mass?
Class 12 · Chemistry
→For an AB-type electrolyte, the van’t Hoff factor is i = 1.5. If its normal molar mass is 80 g mol−1, what are the observed molar mass and degree of dissociation, respectively?
Class 11 · Chemistry
→A 0.1 M solution has an osmotic pressure of 3.69 atm at 300 K. If R = 0.082 L atm K−1 mol−1, what is the van’t Hoff factor i for the solute?
Class 12 · Chemistry
→For the same solute, 1.0 g dissolved in 100 g of solvent gives ΔTf = 0.186 K. If 2.0 g of the same solute is dissolved in 250 g of the same solvent, what will be the new value of ΔTf?
Class 12 · Chemistry
→When 4.0 g of a substance is dissolved in 200 g of water, ΔTf = 0.372 K. If its normal molar mass is 100 g mol−1 and Kf = 1.86 K kg mol−1, what is the van’t Hoff factor i in the solution?
Class 12 · Chemistry
→When 2.0 g of a nonelectrolyte is dissolved in 100 g of solvent, the boiling point of the solution is 373.104 K. The boiling point of the pure solvent is 373.000 K and Kb = 0.52 K kg mol−1. What is the molar mass of the solute?
Class 12 · Chemistry
→When 1.2 g of a nonelectrolyte is dissolved in 100 g of solvent, the freezing point of the solution is 272.814 K. The freezing point of the pure solvent is 273.000 K and Kf = 1.86 K kg mol−1. What is the molar mass of the solute?
Class 12 · Chemistry
→The normal molar mass of an organic acid is 60 g mol⁻¹. In benzene, its observed molar mass is 96 g mol⁻¹. If association occurs only through dimerisation, what is the degree of association?
Class 12 · Chemistry
→In a solution, the observed molar mass of a solute is 72 g mol⁻¹ and its normal molar mass is 120 g mol⁻¹. For an AB-type solute, what is the degree of dissociation?
Class 12 · Chemistry
→A salt of the type AB₂ is 75% dissociated. If its normal molar mass is 120 g mol⁻¹, what will be its observed molar mass?
Class 12 · Chemistry
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