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  4. How much oxygen is required for complete combustion of 560 g of ethene?

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Q. How much oxygen is required for complete combustion of $560\, g$ of ethene?

Some Basic Concepts of Chemistry

Solution:

$\underset{\text{28 g}}{C_2H_4}+\underset{{3\times32=96 g}}{3O_2} \to 2CO_{2}+2H_{2}O$
$28 \,g$ of $C_2 H_4$ requires $96\, g$ of $O_2$
$560\,g$ of requires $\frac{96}{28} \times 560$
$=1920\,g $ or $1.92\,kg$ of $O_{2}$