Question

the difference in the mass of hundred moles each of sodium atom and sodium ions is 5.4 8002 grams compute the mass of an electron.​

Answer 1

Na→Na

+

+e

−

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= 5.48002g

Mass of 1 mole of electron =

100

5.48002

g

Mass of one electron =

100×6.022×10

23

5.48002

=9.1×10

−28

g =9.1×10

−31

kg

Answer 2

$\huge\fbox\red{Hi\:mate}$

$Weight \: of \: 100 \times 6.023 \times {10}^{23} \: atoms \\ = 5.48002g \\ Weigth \: of \: 1000 \times 6.023 \times {10}^{23} \: electron \\ = 5.48002g \\ Weight \: of \: 1 \: electron \\ = \: \frac{5.48802}{6.023} \times {10}^{27} \\ = 0.909848 \times {10}^{27} g \\ = 9.09848 \times {10}^{ - 31} kg$

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