Question

$1$ mole of an aliphatic compound $C_3{H}_8$ is completely burnt in an excess of $O_2$. How many moles of oxygen reacted?

• 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:

$C_3{H}_8+5O_2⟶3C{O}_2+4H_{2}O$

1 mol of $C_3{H}_8$ will produce 3 mol of $C{O}_2$
Hence, Correct Option is (a).