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Question

Total number of electrons present in 18 ml of water: (density of water is 1 g mL1)

A
6.02×1023
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B
6.02×1022
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C
6.02×1024
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D
6.02×1025
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Solution

The correct option is C 6.02×1024
Density of water (given)=1/

18 of water=18 of water

Molecular mass of wwater=18/

1 molecule of H2O contains 10 electrons in total.
[2 electrons from 2H and 8 electrons from O]

Total number of electrons=(No. of electrons in 1 molecule) × (Total no. of molecules)

=10×(Avogadro's number)

6.02×1024 electrons.

Hence, the correct option is C

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