Answer
$N_{2}+3H_{2}\rightarrow 2NH_{3}$
Work Step by Step
Nitrogen gas+ Hydrogen gas$\rightarrow$Ammonia,
That is, $N_{2}+ H_{2}\rightarrow NH_{3}$.
Balancing this reaction, we get
$N_{2}+3H_{2}\rightarrow 2NH_{3}$
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