Science, asked by singhjagga160p74pb6, 1 year ago

The density of liquid mercury is 13.6g/cm3 . how many moles of mercury are there in 1 litre of the metal? (AM of Hg- 200)

Answers

Answered by HarshRedliner
68
As we know , density = mass/volume ..
Here vol and density is given ..
So mass = D*V
= 13.6*1000 .
= 13600g ..
Now moles = given wt/ molecular wt ...
13600/200
= 68 moles
Answered by kingofself
34

Number of ‘moles’ of “Mercury” = 68 moles

Solution:

The number of moles present is calculated using the formula:

Number of moles = Mass of the substance in g or Molecular mass in g

Molar (atomic) mass of Mercury (Hg) = 200

Mass of a substance =\text { Density }(\mathrm{D}) \times \text { Volume }(\mathrm{V})

Volume of mercury = 1 litre = 1000 \mathrm{cm}^{3}

Density of liquid mercury = 13.6 \mathrm{g} / \mathrm{cm}^{3}

Mass of Mercury (M) =D \times V=13.6 \times 1000=13600

M = 13600g

Number of moles of Mercury =\frac{\text { Mass of Mercury }}{\text { The molar mass of Mercury }}=\frac{13600}{200}=68

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