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Compute the difference in masses of 10^3 moles each of magnesium atoms

and magnesium ions.
(Mass of an electron = 9.1×10^{–31} kg)

Sciences - Exemplar Problems

Chapter 3. Atoms and Molecules



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Magnesium atom :  Mg
Magnesium ions : Mg⁺  or Mg²⁺

mass of magnesium atom and  Mg²⁺  will differ by  mass of two electrons.  In one mole of magnesium (24.3 gms) , the difference is : 
   =  9.1 * 10⁻³¹ * 6.023 * 10²³  kg  = 5.48 * 10⁻⁷  kg
   = 0.548 mg

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