13_lect_prob_1

13_lect_prob_1 - m solution of ethylene glycol in water is...

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Chem 125 Dr. Retsek Winter 2008 Ch. 13 Lecture Examples, Part 1 1. If air contains 78% N 2 by volume, what is the solubility of N 2 in water at 25°C and 1 atm? (k H for N 2 in water at 25°C = 7 x 10 -4 mole/L·atm) 2. Calculate the molarity of a solution in which 9.58 g of NaCl is dissolved in a total of 200.0 mL of solution. 3. In the Great Salt Lake in Utah, there are 83.6 g of Na + per kilogram of lake water. What is the molarity of Na + in the lake if the water has a density of 1.160 g/mL? 4. What is the molality of a solution made by dissolving 1.45 g of sucrose in 30.0 mL of water? (molar mass of sucrose = 342.3 g/mole) 5. If density at 20°C of 4.028
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Unformatted text preview: m solution of ethylene glycol in water is 1.024 g/mL, what is the molarity of the solution? (molar mass of ethylene glycol = 62.07 g/mole) Chem 125 Dr. Retsek Winter 2008 6. A sample of aqueous HCl is 11.8 M HCl and has a density of 1.190 g/mL. (a) What is the mass percent of HCl in solution? (b) What is the molality of HCl in solution? (c) What is the mole fraction of HCl in solution? 7. A 0.750 M solution of H 2 SO 4 in water has a density of 1.046 g/mL at 20°C. What is the concentration of this solution in (a) mole fraction, (b) mass percent, and (c) molality? The molar mass of H 2 SO 4 is 98.1 g/mole....
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13_lect_prob_1 - m solution of ethylene glycol in water is...

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