How much volume of air will be needed for complete combustion of 10 lit. of ethane?

135 lit.

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35 lit.

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175 lit.

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205 lit.

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Solution

The correct option is B 175 lit.
Balance equation:
$2 C_{2} H_{6} + 7 O_{2} \to 4 C O_{2} + 6 H_{2} O$
According to reaction 7 mole of oxygen required for 2 mole of ethane so for 10 lit of ethane 35 lit of oxygen is required. As air contains only 20% oxygen so volume of air required is $35 \times 5 = 175$ lit.

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