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Question

Find the total number of electrons present in 1.6 g of CH4.

A
6.023×1023 electrons
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B
6.023×1020 electrons
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C
10 electrons
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D
1 electron
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Solution

The correct option is A 6.023×1023 electrons
Molar mass of CH4=16 g/mol
Electrons in a molecule of CH4=6+(1×4)=10
16 g of CH4 contains =10×6.023×1023 electrons
Hence, 1.6 g of CH4 will contain =10×6.023×1023×1.616=6.023×1023 electrons

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