If in the reaction $N_2O_4 \rightleftharpoons 2NO_2$,$\alpha$ is the fraction of $N_2O_4$ that dissociates,then the total number of moles at equilibrium is:

  • A
    $3$
  • B
    $1$
  • C
    $(1 - \alpha)^2$
  • D
    $(1 + \alpha)$

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