Exercise $2$

A aqueous solution NaOH$15\%W$ will be concentrated by evaporation. $20000K\frac{g}{h}$ fed solution enters in evaporator, where water vapor $)=(1$atm is the thermal fluid. $341,15K$ is the pure solvent boiling temperature, into the evaporator chamber. $16,6$ molality is the concentration of the concentrated solution leaves of the evaporator.

Using the data of the exercise $2,$ answer the following questions:

Q$7)$ The mass fraction of the concentrated solution gets out of the evaporator is: a$)0,6$ ; b$)0,9$ ; c$)0,4$ ; d$)1,1,$ c$)$ none of the above

Q$8)$ The boiling temperature in the evaporator chamber $($expressed at $F)$

a$)98$ ;

b$)66$ ;

c$)208$

; d$)314$ ; i$)$; none of the above.

Q$9)$ The gauge pressure of the evaporator's chamber expressed "Psi":

a$)680,40$ ;

b$)-10,6$; c

c$)-550,01$;

d$)-14,72$;

e$)$ none of the above.

Q$10)$ Assuming $0,4$ as the mass fraction of the concentrated liquid gets out of the evaporator, the mass flow rate $E(K\frac{g}{h})$ is:

a$)18000$ ; b$)50000$ ; c$)12500$ ; d$)4800,$ e$)$ none of the above.

Annexes: $Y_{op}=\frac{x_D}{R_{op}+1},M_{C6H6}=78\frac{g}{m}ol,M_{C7H16}=100\frac{g}{m}ol,M_{\text{N}\text{a}\text{O}\text{H}}=40\frac{g}{m}ol,$ aolality $=$ mol of solute $\frac{?}{Kg}$ solvent.