In the hydrogenation of ethene at $298 \, K$,the number of moles of hydrogen decreases from $2.2$ to $1.4$ in $50 \, min$. Calculate the rate of reaction in units of $mol \, s^{-1}$.
- A$2.67 \times 10^{-4}$
- B$2.67 \times 10^{-8}$
- C$4.86 \times 10^{-3}$
- D$2.96 \times 10^{-4}$
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