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Class 12 · Chemistry
→A substance has a normal molar mass of 120 g mol⁻¹, but freezing-point depression gives an observed molar mass of 60 g mol⁻¹. If it dissociates into two ions, what is the degree of dissociation?
Class 12 · Chemistry
→In a boiling-point-elevation experiment, 3.0 g of a solute is dissolved in 75 g of solvent. If K_b = 0.75 K kg mol⁻¹ and ΔT_b = 0.30 K, what is the molar mass of the solute?
Class 12 · Chemistry
→In the freezing-point-depression method, 1.5 g of a solute is dissolved in 50 g of solvent. If K_f = 2.0 K kg mol^{-1} and ΔT_f = 0.60 K, what is the molar mass of the solute?
Class 12 · Chemistry
→In the osmotic-pressure method, 2.0 g of a solute is dissolved to make 250 mL of solution. At 300 K, the osmotic pressure is 0.984 atm. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry
→Which mistake can greatly change the answer in a molar-mass determination problem involving molality?
Class 12 · Chemistry
→A solution contains 2.5 g of solute dissolved in 500 g of solvent. If the molar mass of the solute is 50 g mol⁻¹, what is the molality of the solution?
Class 12 · Chemistry
→The molar mass of a substance is determined using both freezing-point depression and boiling-point elevation. If the solvent is not the same in both methods, what should be kept in mind?
Class 12 · Chemistry
→Which method requires a semipermeable membrane to determine molar mass?
Class 12 · Chemistry
→Which colligative property is generally considered most suitable for determining the molar mass of a high-molar-mass solute such as a protein?
Class 12 · Chemistry
→If the molar mass of a solute determined from colligative properties is greater than its true molar mass, which process is likely occurring in the solute?
Class 12 · Chemistry
→Why is the osmotic-pressure method considered more suitable than other colligative-property methods for determining the molar mass of polymers?
Class 12 · Chemistry
→Why is a very dilute solution considered suitable in the osmotic-pressure method for molar-mass determination?
Class 12 · Chemistry
→In determining molar mass using colligative properties, what is the main effect of association of solute particles?
Class 12 · Chemistry
→In which situation does association of solute molecules cause the observed molar mass to be greater than the actual molar mass?
Class 12 · Chemistry
→Which colligative property is most suitable for determining the molar mass of a high-molar-mass solute such as a protein?
Class 12 · Chemistry
→If a 0.30 m solution contains 3 g of solute dissolved in 100 g of solvent, what is the molar mass of the solute?
Class 12 · Chemistry
→For a nonelectrolyte, K_f = 1.86 K kg mol⁻¹ and ΔT_f = 0.56 K. What is the approximate molality?
Class 12 · Chemistry
→If the freezing point of a solution is 272.44 K and that of the pure solvent is 273.00 K, what is ΔT_f?
Class 12 · Chemistry
→If the boiling point of a solution is 373.26 K and that of the pure solvent is 373.00 K, what is ΔT_b?
Class 11 · Chemistry
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