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Standard X

Chemistry

Mole Concept and Avogadro's Number

Mass of a mol...

Question

Mass of a mole of electrons is :

0.20 mg

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0.02 mg

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0.55 mg

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1.00 mg

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Solution

The correct option is C 0.55 mg

Mass of one electron is $9.1 \times 10^{- 25}$ mg
Hence mass of 1 mol of electrons = $9.1 \times 10^{- 25} \times 6.022 \times 10^{23} = 54.800 \times 10^{- 2} = 0.5480 = 0.55$ mg

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Mass of a mole of electrons is :

The correct option is C 0.55 mg Mass of one electron is 9.1×10−25 mg Hence mass of 1 mol of electrons = 9.1×10−25×6.022×1023=54.800×10−2=0.5480=0.55 mg

The correct option is C 0.55 mg

Mass of one electron is $9.1 \times 10^{- 25}$ mg
Hence mass of 1 mol of electrons = $9.1 \times 10^{- 25} \times 6.022 \times 10^{23} = 54.800 \times 10^{- 2} = 0.5480 = 0.55$ mg