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Volume of Gases and Number of Moles

The density o...

Question

The density of liquid mercury is $13.6 g c m^{- 3}$ . How many moles of mercury are there in $1$ litre of the metal.
(Atomic mass of $H g = 200$ )

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Solution

$D e n s i t y = \frac{M a s s}{V o l u m e}$
So, $M a s s o f m e r c u r y = D e n s i t y o f H g \times v o l u m e$
$= 13.6 g / c m^{3} \times 1 L = 13.6 g$
$M o l e s o f H g = \frac{M a s s o f H g}{A t o m i c M a s s}$
$= \frac{13.6}{200} = 0.068$

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