What this sample is
An independently authored Chemical question with a complete setup and solution. Use it to evaluate your model selection, handbook path, unit handling, and answer check.
CHFREE PRACTICE SAMPLE
FE Chemical practice questions with worked solutions
FE Chemical practice should begin with a defined process boundary and basis. Once streams, units, and known compositions are explicit, balances and transport models become easier to select and verify.
Try an original Chemical question
Choose an answer before reviewing the solution. Pay attention to the governing model and setup, not only the final choice.
Material and Energy BalancesEasy
Question 1 of 1 free
A feed contains 100 kmol/h with 40 mol% component A. A product stream contains 25 kmol/h of A. The percentage of feed A recovered in that product is most nearly:
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What it is not
It is not an NCEES question and does not come from any NCEES practice exam. For NCEES practice products and current exam policies, use the NCEES exam-prep catalog.
A better review loop for FE Chemical
Practice creates useful evidence only when the review explains why the setup worked or failed. Use this three-part loop after every question.
CHECK 1
Choose a basis
State a time, mass, or molar basis before converting composition and flow information.
CHECK 2
Draw every stream
Label flow rate, composition, phase, and known conditions around the process boundary.
CHECK 3
Count equations and unknowns
Confirm the balance is solvable before adding unnecessary property calculations.
Reference Handbook workflowSearch by process model - component balance, fugacity, heat exchanger, diffusion, reactor design, or control response - then check the assumptions around the equation.