CNG is an important transportation fuel. When 100gCNG is mixed with...

${CH}_{4} + 2{O}_{2} ⟶ {CO}_{2} + 2{H}_{2}O$

$\dfrac{100}{16}\dfrac{208}{32}$

$\dfrac{Numberofmoles}{stoichiometriccoefficient}for{CH}_{4} = \dfrac{6 . 25}{1}\dfrac{Numberofmoles}{stoichiometriccoefficient}for{O}_{2} = \dfrac{6 . 5}{2} = 3 . 25$

The reagent with lower ratio of number of moles to stoichiometric coefficient is called limiting reagent.

Hence, ${O}_{2}$ is limiting reagent

Limiting reagent decides the amount of product,

As per the equation 2 moles of ${O}_{2}$ gives rise to 1 mole of ${CO}_{2}$, So 6.5 moles of ${O}_{2}$ gives $\dfrac{6 . 5}{2}$ moles of ${CO}_{2}$

$⇒ {nCO}_{2} = \dfrac{6 . 5}{2}$

So mass of ${CO}_{2} = \dfrac{6 . 5}{2} \times 44 = 143gm$