Mass of a mole of electrons is

0.20 m g

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0.02 m g

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0.55 m g

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1.00 m g

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Solution

The correct option is C $0.55 m g$
Mass of one electron is $9.1 \times 10^{- 25} m g$
Hence mass of 1 mol of electrons
$= 6.022 \times 10^{23} \times 9.1 \times 10^{- 25} m g = 0.55 m g$

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