Question

CNG is an important transportation fuel. When 100 g CNG is mixed with 208 g oxygen in vehicles, it leads to the formation of CO2 and H2O and produced 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

The correct answer is 143
CH4 + 2O2 → CO2 + 2H2O
wt. of $CH_4$ = 100g
wt. of $O_2$ = 208g
$n_{O_{2}} = \frac{208}{32}$
Here , In the following reaction O2 is limiting reagent
2 moles of O2 → 1 mole of CO2
1 mole of O2 → $\frac{1}{2}$ mole of CO2
$\frac{20}{832}$ mole of O2 → $\frac{208}{32} × \frac{1}{2}$ mole of CO2
→ $\frac{208}{32} × \frac{1}{2} ×$ 44gm of CO2
→ 143 gm of CO2