Discussion
The mole balance on a batch reactor reduces to
Answer: A
Correct answer: accumulation equalling generation
A batch reactor is closed, so nothing flows in or out and both flow terms vanish from the general balance. What remains is that whatever the reaction generates accumulates inside: \[ \frac{\mathrm{d}N_i}{\mathrm{d}t} = r_iV. \] The composition therefore changes with time rather than with position, which is what distinguishes a batch reactor from every flow reactor.
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