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Class 12 · Chemistry
→The normal molar mass of a solute is 90 g mol⁻¹, and 50% of its molecules form dimers. What will be the observed molar mass?
Class 12 · Chemistry
→The normal molar mass of NaCl is 58.5 g mol⁻¹. If the van’t Hoff factor is 1.8 in solution, what is the approximate observed molar mass?
Class 12 · Chemistry
→A solution has an osmotic pressure of 2.46 atm at 300 K and a concentration of 0.1 M. Taking R = 0.082 L atm K⁻¹ mol⁻¹, what is the van’t Hoff factor?
Class 12 · Chemistry
→If 0.01 mol of a substance is present in 100 mL of solution, what is its molarity?
Class 12 · Chemistry
→In the osmotic-pressure method, if the volume of a solution is halved while the amount of solute and temperature remain unchanged, what happens to the osmotic pressure?
Class 12 · Chemistry
→When 1 g of a substance is dissolved in 100 g of a solvent, the elevation in boiling point is 0.052 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass of the substance?
Class 12 · Chemistry
→When 3 g of a nonelectrolyte is dissolved in 500 g of water, ΔTf = 0.186 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass?
Class 12 · Chemistry
→A solution contains 1.8 g of solute dissolved in 200 g of water. If its molality is 0.05 m, what is the molar mass of the solute?
Class 12 · Chemistry
→If a salt gives three ions on complete dissociation, how will the observed molar mass obtained from colligative properties compare with its normal molar mass?
Class 12 · Chemistry
→The normal molar mass of an organic acid is 120 g mol⁻¹. In benzene, its observed molar mass is 240 g mol⁻¹. Which reason explains this result?
Class 12 · Chemistry
→The normal molar mass of a solute is 60 g mol⁻¹, but its observed molar mass from colligative properties is 30 g mol⁻¹. What is the van’t Hoff factor?
Class 12 · Chemistry
→A 0.6 g sample of a substance produces an osmotic pressure of 0.246 atm in 0.2 L of solution at 300 K. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass?
Class 12 · Chemistry
→When 2 g of a nonelectrolyte is dissolved in 200 g of solvent, the elevation in boiling point is 0.052 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass?
Class 12 · Chemistry
→When 1.5 g of a nonelectrolyte is dissolved in 100 g of water, the depression in freezing point is 0.279 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry
→Why can a small error in the temperature difference cause a large error in molar mass determination?
Class 12 · Chemistry
→While calculating molar mass by the osmotic pressure method, if the volume is given as 250 mL, in what form should it be used in the formula?
Class 12 · Chemistry
→The molar mass obtained from freezing-point depression is lower than expected. If the solute is an electrolyte, which reason is suitable?
Class 12 · Chemistry
→If two non-dissociating solutes have equal masses and the first has a lower molar mass, which one will show the greater colligative effect?
Class 11 · Chemistry
→If 0.2 mol of a solute has a mass of 12 g, what is its molar mass?
Class 12 · Chemistry
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