12.29. Mixtures of methanol and 1-0ctanol are prepared, and their temperature is raised to a level above the boiling point of methanol but below that of 1-octanol.

Ideal mixtures What is the boiling point of compound B? Which is more volatile, compound A or compound B? Suppose you mix 1.0 mole of compound A and 4.0 moles of compound B at room temperature (with no air), then heat it. At temperature will the first vapor appear? For the mixture in #3, what will be the composition (mole fraction) in the first vapor? If you have an initial liquid with a mole fraction of A of 0.1, how many theoretical plates are necessary to prepare a mixture which is at least 50% (mole percent) of A?  If you have an initial liquid with a mole fraction of A of 0.1, how many theoretical plates are necessary to prepare a mixture which is at least 50% (mole percent) of C?

Absolute (100%) ethanol is produced from 95% ethanol and 5% water using the Keyes distillation process. Another component, benzene, is added to lower the instability of the alcohol. With these conditions, the product from the top of the distiller is a constant-boiling mixture of 18.5% ethanol, 7.4% H₂O, and 74.1% benzene, as shown here: 95% ethanol 5% water Benzene Distillation tower P(absolute ethanol) = 0.785 g/cm³ P(benzene) = 0.872 g/cm³ 74.1% benzene 18.5% ethanol 7.4% water 100% ethanol Calculate the volume of benzene that should be fed to the still to produce 250 L of absolute ethanol, using this data:

Molecular bromine is 24 percent dissociated at 1600 K and 1.00 bar in the equilibrium Br₂(g) ⇒ 2Br(g). Calculate (a) Kp, (b) A,Gº, (c) K₂ at 2000 K given that A₁HⓇ = +112 kJ mol-¹ over the temperature range.