Which of the following is NOT true about one mole of magnesium chloride?

  1. It has 6.022×10²³ Mg²⁺ ions
  2. It has 2×(6.022×10²³) Cl⁻ ions
  3. It has 6.022×10²³ Mg²⁺ and Cl⁻ ions
  4. It has 6.022×10²³ MgCl₂ formula units

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One mole of MgCl₂ contains 6.022×10²³ Mg²⁺ ions and 1.2044×10²⁴ Cl⁻ ions.
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