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PART - 1 CH - 1 Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 1 Some Basic Concepts of Chemistry2 Marks
Question
If density of liquid mercury is $1 3 . 6$ gram $c m ^{-3}$ then calculate number of moles in 1 liter of mercury. (Atomic mass of mercury $=200$ )
✓

Answer

Mass $=$ volume $\times$ density
Hence mass of 1 liter $(1000 ml )$ mercury $=$$
13.6 g cm^{-3} \times 1000 ml=13600 g
$
$\begin{array}{l}\text { Hence Moles of } Hg =\frac{\operatorname{Mass}( g )}{\text { Atomic mass }} \\ \qquad=\frac{13600}{200}=68 moles \end{array}$

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