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The extent of reaction is useful because it

  • A.expresses every species amount by one variable
  • B.gives the rate at which the reaction proceeds onward
  • C.equals the equilibrium constant at equilibrium exactly
  • D.is always somewhere between zero and one in value

Answer: A

Correct answer: expresses every species amount by one variable

With \( n_i = n_{i0} + \nu_i\xi \), every mole number is fixed once the extent is known, so a single reaction has a single unknown however many species take part. That is what makes the equilibrium calculation tractable: the mole fractions are written in terms of \( \xi \) and the equilibrium condition becomes one equation in one variable.

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