Question

$2.0$ moles of hydrogen gas and $2.0$ moles of oxygen gas react to form water. What is the limiting reagent?

• A. There is no limiting reagent.
• B. Hydrogen gas is limiting.
• C. Oxygen gas is limiting.
• D. The oxygen and hydrogen are both limiting.

Answer 1

Answer: (B)

Hydrogen gas is limiting.

The reactant that produces a lesser amount of product is the limiting reagent.

$2H_2+O_2\to 2H_{2}O$

Here 2 moles of $H_2$ require 1 mole of $O_2$.

But if we take 2 moles of $O_2$ & 2 moles of $H_2$. Still only 2 moles of $H_{2}O$ will be produced because of the limited amount of $H_2$

So, $H_2$ is the limiting reagent.