Solve this: • PROBLEMS FOR PRACTICE
1. Molarity of H2S04 is and its density is 106 g/cm3. What will be its concentration in terms of molality
and mole fraction ?
2. lheconcentration ofH2S04 in a bottle labelled "conc. sulphuric acid" is 18 M. The solution hasadensityof
I •84 g cm-3. What is the mole fraction and weight percentage of H2S04 in this solution ?
3. Calculate the molality of I litre solution of 93% H2S04 (weight/volume). The density of the solutim is
1•84 g mL-l.
4. Calculate the mole fraction of ethanol and water in a sample of rectified spirit which contains 95 per cento!
ethanol by weight.
5. The density ofa 3 M NazS203 (sodium thiosulphate) solution is 1-25 g cm-3. Calculate (0 the
weight of sodium thiosulphate (ii) the mole fraction of sodium thiosulphate (iii) the molality of Na'
S20}- ions.
6. An aqueous solution of sodium chloride is marked 10% (w/w) on the bottle. The density of the solutionis
1071 g mL-l. What is the molality and molarity ? Also what is the mole fraction of each compnentin±
Yilution ?
7• used in lead storage cell is 38% by mass and has a density of I •30 g cm-3. Calculate its molarity.
