Chemistry

Problem

\frac{d[\text{NH}_3]}{dt} = 34 \text{ g hr}^{-1}

for the reaction

\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3

then

\frac{d[\text{H}_2]}{dt}

is ..... g

\text{hr}^{-1}