Discussion
A batch reactor has no inlet or outlet, so its species balance reduces to
Answer: B
Correct answer: accumulation equalling generation
A batch vessel is closed, so both flow terms vanish and whatever the reaction generates simply accumulates: \[ \frac{\mathrm{d}N_i}{\mathrm{d}t} = r_iV. \] The equation has time as its independent variable rather than position, which is what makes a batch reactor an unsteady state problem by nature.
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