How much oxygen is required for complete combustion of 560 ,g of … - Vidyadip

MCQ

How much oxygen is required for complete combustion of $560\,g$ of ethene ? ................. $\mathrm{kg}$

A
$6.4$
✓
$1.92$
C
$2.8$
D
$9.6$

✓

Answer

Correct option: B.

$1.92$

b
$\mathop {{{\text{C}}_2}{{\text{H}}_6}}\limits_{(560\,g)} + 3{{\text{O}}_2} \to 2{\text{C}}{{\text{O}}_2} + 2{{\text{H}}_2}{\text{O}}$

$\mathrm{n}_{\mathrm{C}_{2} \mathrm{H}_{4}}=\frac{560}{28}=20$

$\Rightarrow \mathrm{n}_{\mathrm{O}_{2}}=3 \times \mathrm{n}_{\mathrm{C}_{2} \mathrm{H}_{4}}=60 \,\mathrm{mol}$

$\Rightarrow \mathrm{w}_{\mathrm{O}_{2}}=60 \times 32=1920\, \mathrm{g}$

$=1.92 \,\mathrm{kg}$

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