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Molar Mass Determination

Class 12 Chemistry के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ChemistryA 500 mL solution is prepared using 0.75 g of an unknown solute. Its osmotic pressure at 300 K is 0.123 atm. If R = 0.082 L atm K⁻¹ mol⁻¹, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18HardChemistryA 3.6 g sample of a substance dissolved in 250 g of solvent produces a boiling-point elevation of 0.156 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass of the substance?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18HardChemistryWhen 2.4 g of a nonelectrolyte is dissolved in 300 g of water, the depression in freezing point is 0.1488 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18HardChemistryWhy is the osmotic-pressure method considered more reliable for determining the molar mass of large molecules?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryIf the osmotic-pressure method gives a molarity of 0.015 mol L⁻¹ and 400 mL of the solution contains 1.2 g of solute, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryWhen \(10\,g\) of an unknown solute is dissolved in \(1\,kg\) of solvent, the freezing-point depression is \(\Delta T_f=0.093\,K\). If \(K_f=1.86\,K\,kg\,mol^{-1}\), what is the molar mass of the solute? Assume no association or dissociation.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA solute has an observed molar mass of \(72\,g\,mol^{-1}\). If its van’t Hoff factor is \(i=1.5\), what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryWhen \(5\,g\) of solute is dissolved in \(500\,g\) of solvent, the boiling-point elevation is \(\Delta T_b=0.052\,K\). If \(K_b=0.52\,K\,kg\,mol^{-1}\) and \(i=0.5\), what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16HardChemistryAn \(AB\)-type solute is 25% dissociated. If its observed molar mass is \(80\,g\,mol^{-1}\), what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA substance forms dimers to the extent of 40%. If its true molar mass is \(90\,g\,mol^{-1}\), what is its approximate observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16HardChemistryAn \(AB_2\) solute has a true molar mass of \(150\,g\,mol^{-1}\). If it is dissociated to the extent of 50%, what is its observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16HardChemistryIf \(1.6\,g\) of solute dissolved in \(200\,g\) of water produces a freezing-point depression of \(\Delta T_f=0.372\,K\), and \(i=2\), what is the true molar mass? Take \(K_f=1.86\,K\,kg\,mol^{-1}\).Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16HardChemistryA \(250\,mL\) solution is prepared using \(2.5\,g\) of solute. At \(300\,K\), its osmotic pressure is \(\pi=1.23\,atm\). If \(i=2\), what is the true molar mass? Use \(R=0.082\,L\,atm\,K^{-1}\,mol^{-1}\).Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16HardChemistryA solute has a van’t Hoff factor of \(i=0.75\) and an observed molar mass of \(160\,g\,mol^{-1}\). What is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA solute has a van’t Hoff factor of \(i=1.25\) and an observed molar mass of \(80\,g\,mol^{-1}\). What is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryIf a 0.05 m solution is prepared by dissolving 2.4 g of solute in 400 g of solvent, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryIf a 0.2 m solution contains 0.04 mol of solute and the mass of the solute is 4.8 g, what is its molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16EasyChemistryA 125 mL sample of a 0.04 M solution contains 0.9 g of solute. What is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryIf the elevation in boiling point is 0.312 K, K_b = 0.52 K kg mol⁻¹, the solvent mass is 100 g, and the solute mass is 3 g, what is the molar mass of the non-dissociated solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryFor a non-dissociated solute, K_f = 1.86 K kg mol⁻¹ and ΔT_f = 0.558 K. If 6 g of solute is dissolved in 250 g of solvent, what is its molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium