Question

The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.

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Answer

A sodium atom and ion differ by one electron. For 100 moles each of sodium atoms and ions there would be a difference of 100 moles of electrons.

Mass of 100 moles of electrons = 5.48002 g

Mass of 1 mole of electron = 5.48002 / 100 g

Mass of one electron = (5.48002 / 100 × 6.022 × 1023)

= 9.1 × 10-28 g

= 9.1 × 10-31 kg

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