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Hardness of Water and Treatment

510 mg of a l...

Question

$510 m g$ of a liquid on vaporization in victor Mayer's apparatus displaces $67.2 m l$ of dry air (at NTP). The molecular weight of liquid is:

A

130

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B

17

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C

1700

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D

170

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Solution

The correct option is D $17$
As we know that $1 g$ mole of any gas occupies as $22400 m l$ of volume at STP
So molecular mass of compound= $\frac{0.510 \times 22400}{67.2}$
$\Rightarrow 16.999 \approx 17$

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