Question

$CNG$ is an important transportation fuel. When $ 100\, g\, CNG$ is mixed with $208 $ oxygen in vehicles, it leads to the formation of $CO _{2}$ and $H _{2} O$ and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced in grams is _____. [nearest integer] [Assume $CNG$ to be methane]

Answer 1

$\frac{\text { Mole }}{\text { Stoi. Coeff. }} \stackrel{ }{\frac{6.25}{1}} \frac{6.5}{2}=3.25$
So, $O _{2}$ is limiting reagent
Mole - Mole analysis
$\frac{ n _{ O _{2}}}{2}=\frac{ n _{ co _{2}}}{1}$
$\frac{6.5}{2}= n _{ co _{2}}$
Mass of $CO _{2}=\frac{6.5}{2} \times 44=143 \,gm$