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Question

Calculate the number of moles of electrons present in 54.6 g of electrons.
(Take NA=6×1023)

A
5.0×105 mol
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B
2.0×104 mol
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C
1.0×105 mol
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D
1.0×104 mol
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Solution

The correct option is C 1.0×105 mol
We know,
Mass of one electron =9.1×1031 kg
So, mass of one mole of electron =9.1×1031×6.022×1023 kg

The number of moles in 54.6×103 kg electron
=54.6×1039.1×1031×6×1023 mol
=1.0×105 mol

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