1. A solution contains 15.37 grams of NaCl in 0.621 kg water at 25 °C. What is the vapor pressure of the solution? (The vapor pressure of pure water is 23.7 torr at 25 °C.)
1. A solution contains 15.37 grams of NaCl in 0.621 kg water at 25 °C. What is the vapor pressure of the solution? (The vapor pressure of pure water is 23.7 torr at 25 °C.)
2. The freezing point of benzene is 5.5 °C. What is the molar mass of a nonionizing solute if 1.069 grams of the solute added to 23.16 g of benzene lowers the freezing point to 3.02. The Kf of benzene is 5.12 °C/m.
3. Water has a Kf of 1.86 °C/m. Calculate the new freezing point of an aqueous solution made by mixing 35.60 g water and 1.280 g MgCl2.
4. Ethanol has a Kb of 1.22 °C/m and usually boils at 78.4 °C. How many mol of an nonionizing solute would need to be added to 43.99 g ethanol in order to raise the boiling point to 86.9 °C.
5. A solute is a strong electrolyte that ionizes into 4 ions. What is the molar mass of this solute if 23.95 grams added to exactly 1 kg of solvent change the boiling point by 0.646 °C. (The Kb value for this solute is 1.14 °C/m).
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