1. A mixture consisting of ethanol, carbon tetrachloride, and acetone, and exists as a two-phase vapor/liquid system at T0 and P0. A student is to study the phase stability of this mixture by adding a small amount of acetone into the mixture. It is found, after the addition of acetone, that the system is in fact returned to two-phase equilibrium at the initial T0 and P0. Let denote ethanol as the component 1 , carbon tetrachloride the component 2 , and acetone as the component 3 , 1.2 What's the degree of freedom for this particular mixture? 1.3 If the T and P are to remain the same, can the coverall composition of this mixture be changed (by adding or removing component) without affecting the compositions of the liquid and vapor phase