Q.

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 Hg = 200)

Moderate

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By Expert Faculty of Sri Chaitanya

answer is 68.

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Detailed Solution

$13.6 \times \frac{1000}{200} = 68$

The density of liquid mercury is $13.6 g / {cm}^{3}$ .

$1 L (1000 m L)$ of metal corresponds to $13.6 g / {cm}^{3} \times 1000 {cm}^{3} = 13600 g$ .

Atomic mass of $Hg = 200 g / mol$ .

The number of moles of mercury present in $13600 g$ are $\frac{13600 g}{200 g / mol} = 68 mol$

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