Calculate the vapor pressure lowering for a solution prepared at 25ºC by adding 50.0 mL of the nonvolatile glycerine (C3H8O3, 92.1 g/mol, density 1.26 g/mL) to 500 mL of water (H2O, 18.0 g/mol, density 1.00 g/mL). The vapor pressure of pure water at 25ºC is 3.17 kPa.