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Question

The total number of electrons present in 18 mL water (density 1g/mL) is:

A
6.023×1023
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B
6.023×1024
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C
6.023×1025
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D
6.023×1021
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Solution

The correct option is B 6.023×1024
Mass =18g (m=v×d)

Number of molecules of H2O in 18g mass

=6.023×1023

Number of electrons in 18g water

=6.023×1023×10

=6.023×1024

Hence, the correct option is B

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