A boy wants to prepare an aqueous solution of sucrose with a vapor pressure of 15.0 mm Hg at a temperature of 20 degree celsius. determine how many grams of C12H22O11(sucrose) (mm = 342 g/mol) does he need if he uses 375 grams of Water? it is given that the vapor pressure of water =17.5 mm Hg. at 20 degree celsius temperature)