Chemistry 11 Mole Fraction/Molality Worksheet Date - Ms. Motohashi's ...
Chemistry 11
Mole Fraction/Molality Worksheet
Name: Date:
1. A solution is prepared by mixing 100.0 g of water, H2O, and 100.0 g of ethanol, C2H5OH. Determine the mole fractions of each substance.
2. The molality of an aqueous solution of sugar (C12H22O11) is 1.62m. Calculate the mole fractions of sugar and water.
3. Calculate the molality of 25.0 grams of KBr dissolved in 750.0 mL pure water.
4. What is the molality of NaCl in an aqueous solution which is 4.20 molar? The density of the solution is 1.05 x 103 g/L.
5. Calculate the molarity of a 3.58 m aqueous RbCl solution with a density of 1.12 g/mL.
6. Calculate the molality of a solution containing 16.5 g of dissolved naphthalene (C10H8) in 54.3 g benzene (C6H6).
7. An aqueous solution is prepared by diluting 3.30 mL acetone (d = 0.789 g/mL) with water to a final volume of 75.0 mL. The density of the solution is 0.993 g/mL. What are the molarity, molality and mole fraction of acetone in this solution?
8. The molality of an aqueous solution of sugar (C12H22O11) is 1.62m. Calculate the mole fractions of sugar and water.
9. Determine concentration of a solution that contains 825 mg of Na2HPO4 dissolved in 450.0 mL of water in (a) molarity, (b) molality, (c) mole fraction,
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