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Mole Concept

The density o...

Question

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

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Solution

Given: Volume of $H g$ metal $= 1000 mL$
$Density, d = 13.6 {g cm}^{- 3}$
$∵ d = \frac{m}{V}$
$\Rightarrow m = 13.6 {g mL}^{- 1} \times 1000 mL = 13600 g$
No. of moles of $H g$ metal $= \frac{13600}{200} = 68$

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