Question

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

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

Answer 1

Answer: (B)

Hydrogen gas is limiting reagent.

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

No. of moles of hydrogen $=2moles$

No. of moles of oxygen $=2moles$

So, $1mole$ of $O_2$ is left behind.

So, $H_2$ is completed in the reaction.

So, $H_2$ is limiting reagent.