ESF.1(a) The vapour pressure of water in a saturated solution of calcium nitrate at 20°C is 1.381 kPa. The vapour pressure of pure water at that temperature is2.3393 kPa. What

is the activity of water in this solution? E5F.1(b) The vapour pressure of a salt solution at 100 °C and 1.00 atm is90.00 kPa. What is the activity of water in the solution at this temperature?