Question

1 mole of an aliphatic compound $C_3{H}_8$ is completely burnt in an excess of $O_2$. The reacted moles of oxygen are:

• A. $5\text{mol}$
• B. $2\text{mol}$
• C. $3\text{mol}$
• D. $8\text{mol}$

Answer 1

The correct option is A $5\text{mol}$

Balancing the combustion reaction:
$C_3{H}_8+5O_2\to 3C{O}_2+4H_{2}O$
1 mol of $C_3{H}_8$ will react with 5 mol of oxygen.