JEE MAIN - Chemistry (2022 - 26th June Evening Shift - No. 16)
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 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]
Explanation
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Initially,
Mass of CNG(CH4) = 100 gm
$$\therefore$$ Moles of CH4 = $${{100} \over {16}}$$ = 6.25 moles
Mass of O2 = 208 gm
$$\therefore$$ Moles of O2 = $${{208} \over {32}}$$ = 6.5 moles
From reaction you can see,
1 mole of CH4 react with 2 mole of O2
$$\therefore$$ 6.25 mole of CH4 react with 6.25 $$\times$$ 2 = 12.5 moles of O2
But here only 6.5 moles of O2 present
So, O2 will act as limiting reagent.
$$\therefore$$ Produced CO2 will depends on moles of O2.
From 2 moles of O2 1 mole of CO2
$$\therefore$$ From 6.5 moles of O2 $${{6.5} \over {2}}$$ moles of CO2 produced.
$$\therefore$$ Weight of CO2 = $${{6.5} \over {2}}$$ $$\times$$ 44 = 143 gm
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