Question

How many moles of $H_{2}O$ is produced when ${\text{C}}_3{\text{H}}_8$ undergoes combustion ?

• A. 4

Answer 1

The correct option is A 4
Alkanes on heating in sufficient supply of oxygen undergoes combustion producing carbon dioxide and water. Propane $\left({\text{C}}_3{\text{H}}_8\right)$ combines with oxygen to form carbon dioxide and water. The reaction takes place as follows:

$C_3{H}_8\left(g\right)+5O_2\left(g\right)\to 3{\mathrm{CO}}_2\left(g\right)+4H_{2}O\left(l\right)$

Thus, 3 moles of carbon dioxide and 4 moles of water is produced on combustion of propane.