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प्रश्न
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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उत्तर
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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