Question

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

Answer 1

weight of 100 moles electrons=5.48002g
hence,
weight of 100 x 6.023 x 10^23 atoms =5.48002 g
weight of 10000 x6.023 x 10^23 electrons =5.48002g

weight of 1 electron=5.48002/6.023 x 10^27
=0.909848 x 10^-27 g
=9.09848 x 10^-31 kg

Answer 2

$\bf\huge\textbf{\underline{\underline{According\:to\:the\:Question}}}$

Mass of 100 moles of an electrons  

= 5.48002 g

Now

Mass of 1 mole of an electron

$\bf\huge{\implies\dfrac{5.48002}{100}g}$

$\bf\huge{\implies Mass \:of\: 1\: electron = \drac{5.48002}{100\times 6.022\times 10^{23}}}$

$\bf\huge{\implies 9.1\times 10^{-28g}}$

$\bf\huge{\implies 9.1\times 10^{-31kg}}$