The equation $V=R+D$ represents a mass balance around the

a$)$ reboiler

b$)$ enriching section

c$)$ condenser

d$)$ stripping section

Vacum distillation usually means that the distillation column operates at

a$)0\mathrm{.}1$atm

b$)1\mathrm{.}0$atm

c$)10\mathrm{.}0$atm

d$)0\mathrm{.}02$atm

As going upward the distillation column, the temperatures of stages

a$)$ increase

b$)$ decrease

c$)$ stay constant

The specific gravity $($s$.$g$.)$ of gasoline is about

a$)0\mathrm{.}75$

b$)0\mathrm{.}80$

c$)0\mathrm{.}88$

d$)0\mathrm{.}92$

For a continuous distillation operation, the intercept of the operating line of the enriching section is equal to

a$)\frac{R}{R}+1$

b$)R+\frac{1}{R}$

c$)\frac{x_D}{R}+1$

d$)R+\frac{1}{x_B}$

The number of ideal and actual stages for a distillation tower were $14$ and $20,$ respectively. Determine the efficiency of the column $()$

a$)44\%$

b$)96\%$

c$)55\%$

d$)70\%$

For a binary liquid solution of water and ethanol, $x_E=0\mathrm{.}42,$ determine the normal boiling point of the solution

a$)118C$

b$)91C$

c$)78C$

d$)55C$