6. A researcher measures the concentration toluene in a sealed bottle with 120 mL of water and 80 mL
headspace (gas volume). The total mass of toluene in the bottle is 30 μmol. The first day she takes the
measurement, the laboratory was at 15°C and on the second measurement day, the temperature was 18°C.
Using dimensionless Henry's Law Constants (Hcc) of 0.163 for the first day and 0.191 for the second
day, calculate the concentration of toluene in the liquid phase for both days (umol/L, to one decimal
place), assuming the bottle is at equilibrium on both days. Also, calculate the difference between the
two concentrations (umol/L, one decimal place).