Question asked by Filo student

1. Calculate the molality and mole fraction of the solute in aqueous solution containing $3.0\mathrm{g}$ of urea (molar mass $=60\mathrm{g}{\mathrm{mol}}^{-1}$ ) per $250\mathrm{g}$ of water. 3. Calculate the molarity and molality of 20 per cent aqueous ethanol $({\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ ) solution by volume (density of the solution $=0.960\mathrm{g}$ per ${\mathrm{cm}}^3$ ). Assume the solution to be ideal. 3. A $10{\mathrm{cm}}^3$ sample of human urine was found to have 5 milligrams of urea on analysis. Calculate the molarity of the given sample with respect to urea (Mol. mass of urea $=60$ ). 4. An aqueous solution of a dibasic acid (mol. mass $=118$ ) containing $35.4\mathrm{g}$ of the acid per litre of the solution has density $1.0077\mathrm{g}/{\mathrm{cm}}^3$. Express the concentration of the solution in as many ways as you can. 5. The concentration of ${\mathrm{H}}_2{\mathrm{SO}}_4$ in a bottle labelled "conc. sulphuric acid" is $18\mathrm{M}$. The solution has a density of $1.84\mathrm{g}{\mathrm{cm}}^{-3}$. What is the mole fraction and weight percentage of ${\mathrm{H}}_2{\mathrm{SO}}_4$ in this solution ? 6. A $100{\mathrm{cm}}^3$ solution of sodium carbonate is prepared by dissolving $8.653\mathrm{g}$ of the salt in water. The density of

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Updated on: May 30, 2022