Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions. (Mass of an electron = 9.1×10-31 kg)

Answer: 1.096 × 10–3kg

  • Mg atom has 12 electrons
  • Mg2+ has 10 electrons

Mg2+ ion and Mg atom differ by two electrons.

103 moles of Mg2+ and Mg atoms would differ by 103 × 2 moles of electrons

Mass of 2 ×103 moles of electrons

= 2×103 × 6.023 ×1023 × 9.1 ×10–31 kg

= 2 × 6.023 × 9.1 × 10–5kg

= 109.6004 ×10–5 kg

Mass of 2 ×103 moles of electrons = 1.096 × 10–3kg

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