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

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One hundred pounds of solution containing 80 wt% Na2SO4 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 Na2SO4 per pound of water. Calculate for the composition of the feed.

    a. 31% H2O, 69% Na2SO4                                              c. 45% H2O, 55% Na2SO

b. 45% H2O, 55% Na2SO4                                              d. 69% H2O, 31% Na2SO4

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