I. MODIFIED TRUE OR FALSE. Write TRUE if the statement is correct. If the statement is FALSE, change the underlined word$/$s to make the statement true. $(2$ pts each$)$

$.$ On a T$-$x$-$y plot for a mixture, the single vapor phase exists below the

saturated liquid curve.

$2.$ On a P$-$x$-$y plot for a mixture, the pressure is constant.

$3.$ In a closed non$-$reacting binary system with vapor$-$liquid equilibrium, the degree of freedom $F$ is equal to $2_{?}.$

$4.$ The change in the Gibbs free energy of a system when a small amount of component $i$ is added to the system is indicated by the critical point.

$5.$ In the saturated vapor curve, the number of phases is equal to $1_{?}.$

II$.$ MULTIPLE CHOICE. Write the letter of the correct answer. $(1$ pt each$)$

Which of the following systems is$/$are well$-$modelled by Raoult's Law?

A$.$ n$-$pentane and methanol at $T=426K$

B$.$ n$-$hexane and n$-$pentane at $101\mathrm{.}325$kPa

C$.$ Ethanol$/$toluene at $T=65C$

D$.$ All of the above systems

Following Duhem's theorem and Gibbs Phase Rule, if $F=2,$ how many more extensive variables have to be specified to completely determine the equilibrium state of the system?

A$.0$

B$.1$

C$.2$

D$.3$

The Modified Raoult's law is applicable to pressures.

A$.$ High

B$.$ Low to moderate

C$.$ Negative

D$.$ A and $B$