Discussion
Arrange the steps of solving a material balance problem in the recommended order.
1. count degrees of freedom
2. draw and label a flow diagram
3. write and solve the balances
4. choose a basis of calculation
Answer: A
Correct answer: 2 - 4 - 1 - 3
Draw and label the flowsheet first, because the diagram defines the unknowns. Choose a basis next, since without one the problem has no scale and cannot be solved numerically. Count degrees of freedom then, to confirm it is determinate and to find where to start. Only then write and solve the balances. Working in this order turns most problems into arithmetic.
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