Question

3 volumes of hydrogen are required to combine with one volume of nitrogen to form 2 volumes of ammonia. When 1 mole of hydrogen is allowed to react with the mole of nitrogen, the two gases?

• A. Do not combine
• B. Combine and both the gases are used up completely
• C. 2/3 mole of nitrogen remains unreacted
• D. Some hydrogen remains uncombined

Answer 1

The correct option is C 2/3 mole of nitrogen remains unreacted

$3H_2+N_2\to 3N{H}_3$
So 3 moles of hydrogen produced 1 mole of ammonia
1 mole hydrogen produces $X$ moles of ammonia
$X=\frac{1\times 1}{3}=\frac{1}{3}$ moles
Hence option $C$ is correct.