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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.
Solution
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 = 0.0548002 g
Mass of 1 moles of electron = `0.0548002/100"g"`
Mass f 1 electron = `0.0548002/(100 xx 6.022 xx 10^23)`
= 9.1 × 10−28 g
= 9.1 × 10−31 g
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