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231. Urea forms an ideal solution in water. Determine the vapour pressure of an aqueous solution contains 10% by mass of urea at 40⁰C. (Vapour pressure of water at 40⁰C = 55.3 mm of Hg)

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232. A solution is made by dissolving 30 g of a non-volatile solute in 90g of water. It has a vapour pressure of 2.8 kPa at 298 K. At 298 K, vapour pressure of pure water is 3.64 kPa. Calculate the molar mass of the solute.

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233. At 300 K, 36 g of glucose present per litre in its solution has an osmotic pressure of 4.98 bar. If osmotic pressure of solution is 1.52 bar at the same temperature, what would be its concentration.

222 Views

234.

Calculate the vapour- pressure lowering of water when5.67g of glucose, C₆H₁₂O₆ is dissolved in 25.2 g water at 25⁰C. The vapour pressure of water at 25⁰C is 23.8 mmHg. What is the vapour pressure of the solution?

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235. A 4% solution of sucrose is isotonic with 3% solution of an unknown organic substance. Calculate the molecular mass of unknown resistance.

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236. Calculate molarity and molality of 13% solution (by weight of sulphuric acid. Its density is 1.020 g cm^–3. (At. mass, H = 1,16, S = 32 amu).

Answer:

13 % of solution of sulphuric acid contains 13 g of H₂SO₄in 100 g of the solution. Weight of water = 100 - 13 = 87 g.

mole of H₂SO₄ = 13/98 mole

Volume of H₂SO₄ solution + Weight of soluton / Density = 100/1.02 ml

= 100 / 1.02 x 1/1000 = 1/1.02 litre

Molarity of H₂SO₄ solution = mole of H₂SO₄ / Volume of solution

= 13/98 / 1/1.02 = 10.2 x 13/98 = 1.353 M

Molality of H₂SO₄ solution = mole of H₂SO₄ / wt of water in kg. = 13/98 / 87/1000 = 13/98 x 1000/87

= 1.525 mol kg^-1 (mole Kg^-1)

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237.

What will be the boiling point of bromine when 87.25 x 10^-3 g of Sulphur is added to 39g of bromine? Bromine boils at 332.15K [K_bfor Br₂ -5.2K kgmole^-1]

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238.

The freezing point of a solution containing 0.2g of acetic acid in 20.0 g of benzene is lowered by 0.45⁰C. calculate the degree of association of acetic acid in benzene. (K_f for benzene =5.12K kg mol-1)

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239.

Calculate the amount of ice that will separate out on cooling a solution containing 50g of ethylene glycol in 200g water -9.3⁰C (K_f for water =1.86K kf mol^-1).

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