Which of the following properties of the system would you expect to change as a result of this heating?
A system is in vapor-liquid-liquid equilibrium. One liquid phase contains 96% A and 4% B. The other liquid phase contains 99% B and 1% A. The vapor phase contains 43% A and 57% B. All compositions are on a molar basis.
A small amount of heat is added to the system. At the end of the heating, the system is again in vapor-liquid-liquid equilibrium and still at the original system pressure.
A. The temperature
B. The mole fraction of A in the first liquid phase
C. The mole fraction of A in the vapor phase
D. The mass of the vapor phase
E. All of the above
A. Incorrect. Consider the Gibbs phase rule and try again.
B. Incorrect. Consider the Gibbs phase rule and try again.
C. Incorrect. Consider the Gibbs phase rule and try again.
D. Correct. According to the Gibbs phase rule, there is only one degree of freedom in a system that has three phases and two components. If the pressure remains constant, no other intensive properties can change. But this is an extensive property which will change, as the heat will vaporize some liquids.
E. Incorrect. Consider the Gibbs phase rule and try again.
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