4.Methanol (CH3OH) is a colorless volatile liquid, formerly known as wood alcohol. It boils at
65.0 °C and has a heat of vaporization ΔHvap = 37.4 kJ/mol. What is methanol’s vapor pressure
at 22.0 °C?
5. Butylated hydroxytoluene (BHT) is used as an antioxidant in processed foods (it prevents fats
and oils from becoming rancid). A solution of 2.500 g of BHT in 100.0 g of benzene had a
freezing point of Tf
= 4.880 °C. What is the molar mass of BHT?
The normal freezing point of benzene is 5.5 °C and Kf (benzene) = 5.12 °C/m.
6. The solubility of CO2 in water at 25 °C and PCO2 = 1 atm is 0.034 mol/L. What is its water
solubility under normal atmospheric conditions (in air, carbon dioxide is about 380 ppmv)
assuming that CO2 obeys Henry’s law?