**Structure of Atom – Solutions**

**1) **

**i)Calculate the number of electrons which will together weigh one gram.**

**ii)Calculate the mass and charge of one mole of electrons.**

Solution:

i) Mass of an electron = 9.1 x 10^{-28 } g

9.1 x 10^{-28 } g is the mass of 1 electron

1 g is the mass of 1/ 9.1 x 10^{-28 } electrons

=1.099 x 10^{27} electrons

Hence, the number of electrons that will together weigh one gram is = 1.099 x 10^{27} electrons.

ii) One mole of electrons = 6.022 x 10^{-23} electrons

Mass of one electron= 9.1 x 10^{-28 } g

Mass of 1 mole of electrons = 6.022 x 10^{-23 } x 9.1 x 10^{-28 } g

= 5.48 x 10^{-4 } g

Charge of one electron = 1.6 x 10^{-19 } C

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ShikshaHouse

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Class 11th Chemistry - 2 Structure of Atom - NCERT Solutions

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