# Question: one hundred pounds of solution containing 80 wt na2so4 must...

###### Question details

One hundred pounds of solution containing 80 wt%
Na_{2}SO_{4} must be obtained by evaporating a
dilute solution using a double effect evaporator. If the evaporator
from the 2nd effect is 60% of that coming from the first effect and
the concentrate of the first effect contains 1 lb
Na_{2}SO_{4} per pound of water. Calculate for the
composition of the feed.

a. 31% H_{2}O, 69%
Na_{2}SO_{4}
c. 45% H_{2}O, 55% Na_{2}SO

b. 45% H_{2}O, 55%
Na_{2}SO_{4}
d. 69% H_{2}O, 31% Na_{2}SO_{4}