Discussion
State whether the following is true or false.
For a unit with no reaction, the total balance is independent of the species balances.
Answer: B
Correct answer: False
The total balance is the sum of the species balances, so it carries no information they do not already contain. Writing all the species balances and the total gives one equation more than there are independent relations, and only \( n \) of the \( n+1 \) may be counted. Forgetting that is a common way of appearing to have enough equations when the problem is in fact under-specified.
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