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  • 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.

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:

Number of electrons in Na atom = 11
Number of electrons in Na^{+} = 10
For 1 mole of Na atom and Na+ the difference in electrons = 1 mole
For 100 moles of Na atoms and Na+ ions the difference = 100 moles of electrons
Mass of 100 moles of electrons = 5.48002 g
Mass of 1 mole of electrons =\frac{5.48002}{100}g
Mass of one electron =\frac{5.48002}{100\times6.022\times10^{23}}g
                                       =9.1\times10^{-28}g
                                       =9.1\times 10^{-31}kg

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