Name: ________________________ Hour: ____ Date: ___________ Chemistry: Colligative Properties Freezing Point Depression – 1. How much will the freezing point be lowered if enough sugar is dissolved in water to make a 0.50 molal solution? 2. What is the freezing point of a solution of a nonelectrolyte dissolved in water if the concentration of the solution is 0.24 m? 3. What is the freezing of a solution that contains 68.4 g of sucrose, C12H22O11, dissolved in 1.00x102 g of 4. Suppose that 98.0 g of a nonelectrolyte is dissolved in 1.00 kg of water. The freezing point of this solution is found to be What is the molecular mass of the solute? –0.465oC. 5. A researcher places 53.2 g of an unknown nonelectrolyte in 505 g napthalene. The nonelectrolyte lowers napthalene’s freezing point by 8.8oC. What is the molar mass of the unknown substance? ANSWERS: 1. 0.93oC 2. oC 3. oC 4. 392 amu 5. 81.4 g/mol –0.446 –3.72
Name: ________________________ Hour: ____ Date: ___________ Chemistry: Colligative Properties – Freezing Point Depression 1. How much will the freezing point be lowered if enough sugar is dissolved in water to make a 0.50 molal solution? 2. What is the freezing point of a solution of a nonelectrolyte dissolved in water if the concentration of the solution is 0.24 m? 3. What is the freezing of a solution that contains 68.4 g of sucrose, C12H22O11, dissolved in 1.00x102 g of 4. Suppose that 98.0 g of a nonelectrolyte is dissolved in 1.00 kg of water. The freezing point of this solution is found to be –0.465oC. What is the molecular mass of the solute? 5. A researcher places 53.2 g of an unknown nonelectrolyte in 505 g napthalene. The nonelectrolyte lowers napthalene’s freezing point by 8.8oC. What is the molar mass of the unknown substance? ANSWERS: 1. 0.93oC 2. –0.446 oC 3. –3.72 oC 4. 392 amu 5. 81.4 g/mol
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