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Question

The difference between 100 moles of sodium and sodium ions is 5.48002g. Calculate the mass of an electron.

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Solution

Sodium loses an electron to form sodium ions.
Na → Na+ + e

Sodium atom loses an electron to form sodium ion.

1 mole of Sodium atom has the difference of 1 electron.

So, 100 moles of Sodium atoms will have the difference of 100 electrons.

For 100 moles of each sodium atom and sodium ion, there would be a difference of 100 moles of electrons.

One mole of electrons has 6.023×1023e
Given that,Mass of 100 moles of electron = 5.48002g
Mass of 1 mole of electron = (5.48002/100)g
Mass of 1 electron = 5.48002/(100×6.023×1023e ) = 9.1×1028g or 9.1×1031kg


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