PROBLEMS

11.1-1.

Phase Rule for a Vapor System. For the system NH3–water and only a vapor phase present, calculate the number of degrees of freedom. What variables can be fixed?

A1: Ans. F = 3 degrees of freedom; variables T, P, yA
11.1-2.

Boiling Point and Raoult's Law. For the system benzene–toluene, do as follows, using the data from Table 11.1-1:

  1. At 378.2 K, calculate yA and xA using Raoult's law.

  2. If a mixture has a composition of xA = 0.40 and is at 358.2 K and 101.32 kPa pressure, will it boil? If not, at what temperature will it boil and what will be the composition of the vapor first coming off?

11.1-3.

Boiling-Point-Diagram Calculation. The vapor-pressure data are given below for the system hexane–octane:

  Vapor Pressure
  n-Hexanen-Octane ...

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