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Stoichiometry

Ammonia is a ...

Question

Ammonia is a very useful ingredient in cleaning agents, fertilizers and explosives as seen in the image below. Unfortunately, it is also thermodynamically unfavorable reacdtion:
$N_{2 (g)} + H_{2 (g)} \to N H_{3 (g)}$
How many moles of reactants must be used to generate 1 mole of ammonia?

1 m o l e

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2 m o l e s

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3 m o l e s

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4 m o l e s

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Solution

The correct option is B $2 m o l e s$
$N_{2} + 3 H_{2} ⇌ 2 N H_{3}$
To generate $2 m o l e s$ of $N H_{3}$ , we need $1 m o l e$ of Nitrogen and $3 m o l e s$ of Hydrogen i.e. total of $4 m o l e s .$
So, for $1 m o l e$ of ammonia, $2 m o l e s$ of reactants must be used.

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