For the reaction $2SO_2 + O_2 \to 2SO_3$,the rate of disappearance of $O_2$ is $2.0 \times 10^{-4} \ mol \ L^{-1}s^{-1}$. The rate of appearance of $SO_3$ is:

  • A
    $2.0 \times 10^{-4} \ mol \ L^{-1}s^{-1}$
  • B
    $4.0 \times 10^{-4} \ mol \ L^{-1}s^{-1}$
  • C
    $1.0 \times 10^{-4} \ mol \ L^{-1}s^{-1}$
  • D
    $6.0 \times 10^{-4} \ mol \ L^{-1}s^{-1}$

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