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Mole Concept

11.2 L of CH4...

Question

$11.2 L$ of $C H_{4}$ and $22.4 L$ of $C_{2} H_{6}$ are mixed at STP. Choose the correct statement(s).

Vapour density of the mixture is 12.67

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Average molecular weight will be less than 16

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Average molecular weight will be greater than 16 and less than 30

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Average molecular weight will be greater than 30

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Solution

The correct option is C Average molecular weight will be greater than 16 and less than 30
Average molecular weight $= \frac{1}{3} \times 16 + \frac{2}{3} \times 30 = 5.33 + 20 = 25.33$ Average molecular weight is greater than 16 and less than 30.
$Vapour density = \frac{Molecular weight}{2} = 12.67$

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