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Class 12 · Chemistry
→If \(2.0\,\mathrm{g}\) of solute in \(1.0\,\mathrm{L}\) of solution gives an osmotic pressure of \(0.492\,\mathrm{atm}\) at \(300\,\mathrm{K}\), what is the molar mass? Use \(R=0.082\,\mathrm{L\,atm\,K^{-1}\,mol^{-1}}\).
Class 12 · Chemistry
→When \(4.0\,\mathrm{g}\) of a solute is dissolved in \(400\,\mathrm{g}\) of solvent, \(\Delta T_f=0.50\,\mathrm{K}\). If \(K_f=5.0\,\mathrm{K\,kg\,mol^{-1}}\), what is the molar mass of the solute?
Class 12 · Chemistry
→In a molar mass experiment, \(\Delta T_b\) is found to be lower than expected. If the solute is an acid in an organic solvent, what is the probable reason?
Class 12 · Chemistry
→In a molar mass determination experiment, \(\Delta T_f\) is found to be greater than expected. If the solute is an electrolyte, what is the most suitable reason?
Class 12 · Chemistry
→A solution has osmotic pressure \(1.23\,\mathrm{atm}\) at \(300\,\mathrm{K}\). If the concentration of the same solution is halved while the temperature remains \(300\,\mathrm{K}\), what will be the new osmotic pressure?
Class 12 · Chemistry
→If a solution has van’t Hoff factor \(i=0.8\) and normal molar mass \(200\,\mathrm{g\,mol^{-1}}\), what will be the observed molar mass?
Class 12 · Chemistry
→If a solute forms trimers to the extent of 50% during molar-mass determination, what will be the value of the van’t Hoff factor i?
Class 12 · Chemistry
→Which colligative property is most suitable for determining the molar mass of macromolecules such as proteins, which have very high molar masses?
Class 12 · Chemistry
→A solute has a van’t Hoff factor i = 3 and an observed molar mass of 40 g mol⁻¹. What is its normal molar mass?
Class 12 · Chemistry
→A solution contains 1.8 g of solute dissolved in 90 g of solvent. If Kf = 1.5 K kg mol⁻¹ and ΔTf = 0.30 K, what is the molar mass of the solute?
Class 12 · Chemistry
→If association of a solute makes the observed elevation in boiling point equal to 0.75 of the expected value and the solute forms dimers, what is the degree of association?
Class 12 · Chemistry
→A solution has a freezing-point depression 1.5 times the expected value for a non-dissociated solute. If the solute dissociates into two ions, what is the degree of dissociation?
Class 12 · Chemistry
→If a 0.01 M non-dissociating solute has an osmotic pressure of 0.246 atm at 300 K, what will be the osmotic pressure of a 0.02 M solution of the same solute at the same temperature?
Class 12 · Chemistry
→Which method remains comparatively easier to measure even at very low concentration while determining molar mass?
Class 12 · Chemistry
→Which colligative property is most suitable for determining the molar mass of a polymer in a dilute solution?
Class 12 · Chemistry
→Equal masses of two non-dissociating solutes are dissolved separately in equal masses of the same solvent. If both solutions show the same depression in freezing point (ΔTf), what can be concluded about their molar masses?
Class 12 · Chemistry
→When 2.0 g of solute is dissolved in 50 g of solvent, ΔTb = 0.40 K. If Kb = 0.80 K kg mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry
→If 1.0 g of solute is present in 100 g of solvent, Kf = 1.86 K kg mol⁻¹, and the molar mass is 100 g mol⁻¹, what is the ideal ΔTf?
Class 12 · Chemistry
→Which of the following colligative properties is most suitable for determining the molar mass of a high-molar-mass solute such as a polymer?
Class 12 · Chemistry
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