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Class 12 · Chemistry · Easy
→A solute has a normal molar mass of 100 g mol⁻¹ and an observed molar mass of 125 g mol⁻¹. What is the value of i?
Class 12 · Chemistry · Easy
→If the observed molar mass of a solute is greater than its actual molar mass, which phenomenon does this generally indicate?
Class 12 · Chemistry · Medium
→During molar-mass determination by the elevation-in-boiling-point method, for which solute is the observed molar mass likely to be greater than its true molar mass?
Class 12 · Chemistry · Easy
→Which colligative property is considered most suitable for determining the molar mass of high-molar-mass substances such as proteins?
Class 12 · Chemistry · Medium
→A solution contains 0.25 g of solute in 250 mL of solution. At 300 K, its osmotic pressure is 0.246 atm. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry · Medium
→A solution contains 2 g of solute in 200 g of solvent. If Kf = 4.0 K kg mol⁻¹ and ΔTf = 0.50 K, what is the molar mass of the solute?
Class 12 · Chemistry · Medium
→If the molar mass of a solute obtained by the osmotic pressure method is unusually large, which experimental cause should be checked first?
Class 12 · Chemistry · Medium
→Which colligative property is most suitable for determining the molar mass of proteins having very high molar mass?
Class 12 · Chemistry · Medium
→If a \(0.1\,\mathrm{mol\,kg^{-1}}\) solution has a boiling-point elevation of \(0.104\,\mathrm{K}\), and \(K_b=0.52\,\mathrm{K\,kg\,mol^{-1}}\), what is the van't Hoff factor \(i\)?
Class 12 · Chemistry · Easy
→Which property is required to determine the molar mass of a solute by the freezing-point-depression method?
Class 12 · Chemistry · Medium
→When \(1.2\,\mathrm{g}\) of a substance is dissolved in \(60\,\mathrm{g}\) of solvent, \(\Delta T_f=0.40\,\mathrm{K}\). If \(K_f=2.0\,\mathrm{K\,kg\,mol^{-1}}\), what is the molar mass?
Class 12 · Chemistry · Medium
→While determining the molar mass of an unknown solute by the osmotic-pressure method, which type of solution is most suitable?
Class 12 · Chemistry · Medium
→Which colligative property is most suitable for determining the molar mass of a high-molar-mass solute such as a polymer?
Class 12 · Chemistry · Medium
→When \(2\,\mathrm{g}\) of a non-dissociating solute is dissolved in \(100\,\mathrm{g}\) of solvent, \(\Delta T_b=0.52\,\mathrm{K}\). If \(K_b=0.52\,\mathrm{K\,kg\,mol^{-1}}\), what is the molar mass?
Class 12 · Chemistry · Hard
→If the solvent mass in a freezing-point-depression experiment is incorrectly recorded as \(120\,\mathrm{g}\) instead of \(100\,\mathrm{g}\), while all other values are correct, how will the calculated molar mass compare with the actual value?
Class 12 · Chemistry · Hard
→If \(K_b\) is correct but \(\Delta T_b\) is measured 20% higher than its actual value during molar-mass determination, how will the calculated molar mass compare with the actual molar mass?
Class 12 · Chemistry · Hard
→A solute has observed molar mass \(80\,\mathrm{g\,mol^{-1}}\) and van't Hoff factor \(1.5\). What is its normal molar mass?
Class 12 · Chemistry · Medium
→When 5 g of an unknown solute is dissolved in 500 g of water, the freezing-point depression is 0.186 K. For water, K_f = 1.86 K kg mol⁻¹. What is the molar mass of the solute?
Class 12 · Chemistry · Medium
→Why is osmotic pressure considered most suitable for determining the molar mass of heat-sensitive, high-molar-mass solutes such as proteins?
Class 12 · Chemistry · Hard
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