Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AIIMS2013ChemistrySolutions

Boiling point of benzene is 353.23 ~K . When 1.8 ~g of non-volatile solute is dissolved in 90 ~g of benzene. Then boiling point is raised to 354.11 ~K . Given K_b (benzene) =2.53 ~kg ~mol ⁻¹ . The molecular mass of non-volatile substance is

Options

  1. A58 ~g ~mol ⁻¹
  2. B120 ~g ~mol ⁻¹
  3. C116 ~g ~mol ⁻¹
  4. D60 ~g ~mol ⁻¹

Correct answer

A. 58 ~g ~mol ⁻¹

Step-by-step solution

T_b^ =353.23 ~K , W_B=1.8 ~g , W_A=90 ~g _ T_b=354.11 ~K , K_b=2.53 ~kg mol ^ - 1 T_b=T_b-T_b ^ =354.11-353.23=0.88 ~K M_B= W_B K_b 1000 T_b W_A = 1.8 2.53 1000 0.88 90 =57.5 58 ~g ~mol ⁻¹

Practice Solutions on Quantrex Academy →

More from Solutions

What is boiling point of solution containing 7.45 g of KCl in 500 g of water, assuming 80 % dissociation of KCl ? (molar mass of KCl = 74.5 g/mole , k_b for water = 0.52 K/molal ) 2026Identify from the following pair of solutions on mixing exhibits positive deviation from Raoult's law. 2026A solution containing 1.2 g nonvolatile solute in 100 g. of a solvent has a boiling point elevation 1.2 K. Calculate the molar mass of solute if molal elevation constant of solvent 2026The osmotic pressure of barium chloride and glucose solution of the same concentration at the same temperature are respectively 0.62 atm and 0.24 atm. Calculate the van't Hoff fact 2026Which of the following aqueous solutions exhibits maximum freezing point depression assuming complete dissociation? 2026A solution contains 50 g of common salt in 500 gm of water. Find the concentration of the solution in terms of percentage. 2026What should be the molarity of aqueous solution of K ₂ SO ₄ so that it is isotonic with aqueous 1 M glucose at same temperature, assuming complete dissociation? 2026Which of the following solutions has maximum vapour pressure? 2026 Full Solutions list All AIIMS PYQs