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:
$N_{2\left(g\right)}+H_{2\left(g\right)}\to N{H}_{3\left(g\right)}$
How many moles of reactants must be used to generate 1 mole of ammonia?

• A. $1mole$
• B. $2moles$
• C. $3moles$
• D. $4moles$

Answer 1

The correct option is B $2moles$

$N_2+3H_2\rightleftharpoons 2N{H}_3$

To generate $2moles$ of $N{H}_3$, we need $1mole$ of Nitrogen and $3moles$ of Hydrogen i.e. total of $4moles.$

So, for $1mole$ of ammonia, $2moles$ of reactants must be used.