(Solved): 4. Explain why it is necessary to remove the Erlenmeyer flask from the hot water bath at the moment ...

4. Explain why it is necessary to remove the Erlenmeyer flask from the hot water bath at the moment the volatile liquid disappears from the flask, rather than while there is still liquid in the flask, or minutes after the liquid has completely evaporated. 5. Describe the experimental data which would be needed to determine the molecular mass of an unknown gas. 6. In an experiment similar to the one you will be conducting this week; \( 1.40 \mathrm{~g} \) of vapor of an organic compound at its boiling point of \( 111^{\circ} \mathrm{C} \) and \( 730 \mathrm{~mm} \mathrm{Hg} \) filled up a \( 500 \mathrm{~mL} \) Erlenmeyer flask. Calculate the molar mass of the compound.