Which one of the following equations is correct for the reaction $N_{2(g)} + 3H_{2(g)} \longrightarrow 2NH_{3(g)}$?
- A$3 \frac{d[NH_3]}{dt} = 2 \frac{d[H_2]}{dt}$
- B$3 \frac{d[NH_3]}{dt} = 3 \frac{d[H_2]}{dt}$
- C$2 \frac{d[NH_3]}{dt} = -3 \frac{d[H_2]}{dt}$
- D$3 \frac{d[NH_3]}{dt} = -2 \frac{d[H_2]}{dt}$
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