Consider a gas phase reaction which occurs in a closed vessel: $2A \rightarrow 4B + C$. The concentration of $B$ is found to be increased by $5 \times 10^{-3} \ mol \ L^{-1}$ in $10 \ s$. The rate of disappearance of $A$ (in $mol \ L^{-1} \ s^{-1}$) is:

  • A
    $4.75 \times 10^{-4}$
  • B
    $7.5 \times 10^{-4}$
  • C
    $1.25 \times 10^{-4}$
  • D
    $2.5 \times 10^{-4}$

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