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Class 12 · Chemistry
→An AB-type solute is 75% dissociated. If its observed molar mass is 80 g mol⁻¹, what is its true molar mass?
Class 12 · Chemistry
→A substance forms trimers and is 30% associated. If its true molar mass is 90 g mol⁻¹, what will be the approximate observed molar mass?
Class 12 · Chemistry
→A substance undergoes 40% dimerization. If its observed molar mass determined by a colligative method is 150 g mol⁻¹, what is its true molar mass?
Class 12 · Chemistry
→A 750 mL sample of a 0.02 M solution contains 3.0 g of solute. If i = 1.25 and the given molarity is the actual solute molarity, what is the observed molar mass?
Class 12 · Chemistry
→When 6 g of a solute is dissolved in 300 g of solvent, the elevation in boiling point is 0.156 K. If K_b = 0.52 K kg mol⁻¹ and i = 0.75, what is the true molar mass?
Class 12 · Chemistry
→When 4 g of a solute is dissolved in 500 g of water, the depression in freezing point is 0.279 K. If the van’t Hoff factor is 1.5, what is the true molar mass?
Class 12 · Chemistry
→A student mistakenly takes 250 g solvent as 250 kg. In the freezing-point method, how will the calculated molar mass compare with the correct value?
Class 12 · Chemistry
→A 0.05 M solution has osmotic pressure 1.845 atm at 300 K. If the true molar mass of the solute is 120 g mol−1, what observed molar mass will be obtained from the colligative method?
Class 12 · Chemistry
→The observed molar mass of an AB3-type solute is 4/7 of the true value. What is the degree of dissociation?
Class 12 · Chemistry
→A solute forms dimers. Its true molar mass is 90 g mol−1 and its observed molar mass is 120 g mol−1. What is the degree of association?
Class 12 · Chemistry
→The true molar mass of AlCl3 is 133.5 g mol−1. If the observed molar mass from a colligative method is 44.5 g mol−1, what is the degree of dissociation?
Class 12 · Chemistry
→In the vapour-pressure method, the mole fraction of solute is found to be 0.04. If 1.8 g solute was dissolved in 18 g water, what is the approximate molar mass of the solute?
Class 12 · Chemistry
→A 300 mL solution is prepared using 2.4 g solute. Its osmotic pressure at 300 K is 0.492 atm. If the solute forms dimers and i = 0.5, what is the true molar mass?
Class 12 · Chemistry
→When 3 g of an AB2-type solute is dissolved in 250 g water, ΔTf = 0.558 K. If dissociation is 50% and Kf = 1.86 K kg mol−1, what is the true molar mass?
Class 12 · Chemistry
→In molar mass determination, a student treats 100 g solvent as 100 kg while calculating molality. What will happen to the result?
Class 12 · Chemistry
→A 0.04 m solution is formed by dissolving 2.0 g of a nonelectrolyte in 0.5 kg solvent. If 4.0 g of the same solute is dissolved in 0.25 kg of the same solvent, what will be the new molality?
Class 12 · Chemistry
→A solution contains 4.0 g of solute in 250 g of solvent. If Kf = 2.0 K kg mol⁻¹ and the freezing-point depression is 0.4 K, what is the molar mass of the solute?
Class 12 · Chemistry
→The normal molar mass of a solute is 180 g mol⁻¹, while its observed molar mass in solution is 72 g mol⁻¹. If the solute is of the type AB₂, what is the degree of dissociation?
Class 12 · Chemistry
→A 1.0 L solution is prepared by dissolving 2.2 g of a substance. Its osmotic pressure at 300 K is 0.451 atm. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the approximate molar mass of the substance?
Class 12 · Chemistry
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