Question

From $2$ moles of $KCl{O}_3$ by decomposition of all the $KCl{O}_3$, how many liters of $O_2$ can be produced at STP?

• A. $11.2$
• B. $22.4$
• C. $33.6$
• D. $44.8$
• E. $67.2$

Answer 1

The correct option is E $67.2$

$2KCl{O}_3\to 2KCl+3O_2$

The decomposition of 2 moles of $KCl{O}_3$ produces 3 moles of $O_2$.

At STP, 1 mole of $O_2$ will occupy a volume of 22.4 L.

At STP, 3 moles of $O_2$ will occupy a volume of $3\times 22.4=67.2$ L.

Hence, the correct answer is option $\text{E}$.