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For a constant volume batch reaction, conversion relates to concentration as

  • A.the difference in the moles alone
  • B.one minus the concentration ratio
  • C.the ratio of current to initial concentration
  • D.the product of the two concentrations

Answer: B

Correct answer: one minus the concentration ratio

At constant volume the moles and the concentrations are proportional, so \[ X = 1 - \frac{C_A}{C_{A0}}. \] The ratio itself is the fraction *remaining* rather than the fraction converted, which is the option offered beside the key. The relation fails at varying volume, where the mole form must be used instead.

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