HOMEWORK 3

1. It takes 74.5 g of CaCl₂ to saturate 100g of water at 25 C. What is the equilibrium relative humidity above this solution? What is the vapor pressure above this solution?
   
2. What is the vapor pressure of ice at -20 C? What is the energy of sublimation at -20 C?
   
3. How much salt (Na Cl) must be added to water to lower the vapor pressure to 80% of that for pure water?

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