Question

Answer with True or False and correct the false statements. a) Temperature, pressure, and composition of two phases at equilibrium remain unchanged. b) Mass transfer depends on the departure of the system from equilibrium. c) When a liquid is heated up slowly at constant pressure, the temperature at which the first vapor bubble forms is the bubble-point temperature of the liquid at the given pressure. d) When a vapor is cooled down slowly at constant pressure, the temperature at which the first liquid droplet appears is the dew-point temperature of the vapor at the given pressure. e) When a liquid/vapor mixture is compressed at constant temperature, the pressure at which the last vapor bubble disappears is the bubble-point pressure of the liquid at the given temperature. f) A tie line is a line connecting the composition of two phases at equilibrium at a given temperature and pressure. g) A binary mixture can have more than one critical point. h) A pure substance could have more than one critical point. i) An azeotrope is the point at which the composition of the liquid is the same as that for vapor. j) Under some conditions, a pure substance can form an azeotrope. k) If the mole fraction of component 1 in the vapor phase is more than that of component 2, then component 1 is more volatile than component 2. l) In Raoult’s law, we assume that both vapor and liquid phases are ideal. m) At constant P, the bubble point equals the dew point T. n) For a binary mixture, the bubble point P is higher than the dew point P at fixed T.

Answer with True or False and correct the false statements.
a) Temperature, pressure, and composition of two phases at equilibrium remain unchanged.
b) Mass transfer depends on the departure of the system from equilibrium.
c) When a liquid is heated up slowly at constant pressure, the temperature at which the first vapor bubble forms is the bubble-point temperature of the liquid at the given
pressure.
d) When a vapor is cooled down slowly at constant pressure, the temperature at which the
first liquid droplet appears is the dew-point temperature of the vapor at the given
pressure.
e) When a liquid/vapor mixture is compressed at constant temperature, the pressure at
which the last vapor bubble disappears is the bubble-point pressure of the liquid at the
given temperature.
f) A tie line is a line connecting the composition of two phases at equilibrium at a given
temperature and pressure.
g) A binary mixture can have more than one critical point.
h) A pure substance could have more than one critical point.
i) An azeotrope is the point at which the composition of the liquid is the same as that for
vapor.
j) Under some conditions, a pure substance can form an azeotrope.
k) If the mole fraction of component 1 in the vapor phase is more than that of component
2, then component 1 is more volatile than component 2.
l) In Raoult’s law, we assume that both vapor and liquid phases are ideal.
m) At constant P, the bubble point equals the dew point T.
n) For a binary mixture, the bubble point P is higher than the dew point P at fixed T.

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