Question

THE VAPOR 23.77 mm PURE WATER PRESSURE OF 25C./F THe VAPOR PRESSURE 4T AT 25 C WHAT IS THE MOLALITY UF AN AGUEOUS UREA, CO(NH2)ASSume THAT Hy ABOVE THe SOLUTION IS 22.83 mm SOLUTION OF UREA IS NON-NOCATILE 2 WHAT THE VAPOR PRESSURE oF Hno IF THE VAPOR PRessuRe OF PURE UATER 2-2 mock 23.8 MMHa AT 2 S

Answer 1

Antwo nure solvent) I when solute crea which is no volatile is added to water (pure so the vapor pressure of solution decreas According to Raoult's law pops - Xsolute po Xsolute = Mole fraction po :: Vapor Pressure ps = Vapor pressure of - We of solute of puse solvent solution . pops M₂ We the M₂ Mi W₂ = mass of solute M2 =. Molar mass of solute WI = Mass of solvent M = Molar mass of Solvent

for very very dilute solution : Pops Wa y al = mola modality = pops non poz 23.77 mm Ha ps = 22-83 mmile molality = 23.77 - 22-83. 23.77 a 0094 23.77 = 0.03 95m molality = 0·0395m

DELTAPDOW) Dato . Call of Molar Mass. = 180.156 g/mol M = 2.50m ps - Vapor pressure of CHO Po = Vapor pressure bi 23.8mm Ha Po-ps a m 3.४-15 - 25 2368 2308 - Ps = 205 X2 3.8 = 5905 : Ps = 23.8 - 5905 Psa 3507 Vapor pressure of 2.5. molal CHIOS. is 357 mmHg