Question

find the mass of......
(1) 2.5 moles of Cl2

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Class= 11th
Subject = Chemistry
Chapter = Some basic concepts of chemistry
Topic = Mole concept

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Answer 1

Explanation:

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Answer 2

Solution:-

Atomic mass of Cl = 35.5

Now Atomic mass of Cl₂ = 2 × 35.5= 71

Moles of Cl₂ = 2.5 Given

☆Formula

$\sf \: number \: of \: moles \: of \: atom \\ = \sf\dfrac{weight \: in \: gm}{atomic \: mass}$

Put the formula

$\sf 2.5= \sf\dfrac{weight \: in \: gm}{71}$

$\sf \: weight \: in \: gm \: = 2.5 \times 71$

$\sf \: weight \: in \: gm \: = 177.5gm$

Some information about mole concept

A mole is defined as the amount of substance that contains as many atoms, molecules,ions electrons or any other elementary

Some formula

$\to \sf \: number \: of \: \: moles \: of \: aton \: \\ = \sf \frac{weight \: in \: gm}{atomic \: mass}$

$\sf \: \to \: number \: of \: moles \: of \: molecules \\ = \sf \frac{weight \: in \: gm}{molecular \: mass}$

$\sf \to \: number \: of \: moles \: of \: gases \\ \sf = \frac{volume \: at \:STP }{22.7}$

$\sf \to \: number \: of \: moles \: of \: gas \: \\ = \sf \frac{volume \: at \: NTP}{22.4}$

$\sf \to \: number \: of \: mole \: of \: particles \\ = \sf \: \frac{number \: of \: particles}{avogadro \: number}$