Discussion
State whether the following is true or false.
A material balance can be written around any envelope drawn on a flowsheet.
Answer: B
Correct answer: True
An envelope may be drawn anywhere - around one unit, several, or the whole plant - and a valid balance follows for whatever streams cross it. That freedom is the main tool available: choosing an envelope that cuts few streams, or that excludes the units carrying the awkward unknowns, often gives the answer in one equation where a unit-by-unit march would take several.
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