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# Exset3 - Nielsen CHM1041 Exercise Set 3 1 What is the...

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Nielsen Bhaskar/PC/1713P/J 3/05 1 CHM1041 Exercise Set 3 1. What is the percent sucrose (cane sugar), by weight, in a syrup prepared by dissolving 756 g sucrose in 1.20 kg water/ 2. The solubility of KNO 3 in water at 20°C. is 31.6g KNO 3 per 100 ml H 2 O. The density of water at 20°C is 0.998 g/ml. What is the percent KNO 3 , by weight, in the saturated solution? 3. A solution is prepared by mixing the following numbers of moles of hydrocarbons: 1.28 mole C 7 H 16 , 1.80 mole C 8 H 18 and 2.16 mole C 9 H 18 and 2.16 mole C 9 H 20 . What are (a) the mole fraction and (b) the mole percent of each component in this solution? 4. Calculate the mole fractions of ethyl alcohol, C 2 H 5 OH, and water in a solution made by dissolving 9.20 g of the alcohol in 18.0 g of water. 5. a) Calculate the molality of a solution made by dissolving 262 g of ethylene glycol, C 2 H 6 O 2 , in 8000.g of water. b) What is the molality of P-dichlorobenzene in a solution prepared by dissolving 5.50 g C 6 H 4 Cl 2 in 65.0g benzene, C6H 6 ? c) What is the molality of a solution obtained by dissolving 15.2g urea, CO(NH 2 ) 2 , in 100.0 ml ethanol at 20°C ? The density of ethanol at 20°C is 0.789 g/ml.

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