Equivalents express the combining power of an element for example what mass of an element can combine with or displace one gram of hydrogen or eight grams of oxygen.
Since Mg is divalent, one gram of Mg2+ can combine with 2 grams of hydrogen
Therefore, 0.6 mole of Mg2+ can combine with 0.6 x 2 = 1.2 moles of hydrogen
Hence there are 1.2 equivalents in 0.60 mole of Mg2+
The number of equivalents that are in 0.60 mole of Mg²⁺ is;
1.2 Eq
In chemistry of ions, equivalents can be defined as the number of moles of monovalent ions required to neutralize the charge of an ion with an opposite charge.
Now, the formula to calculate the number of equivalents is;
Number of equivalents = number of moles × valence
We are dealing with 0.60 moles of Mg2+. This means that;
Number of moles = 0.6 moles
Elements in the same group of the periodic table have the same valency. Mg²⁺ is magnesium ions and thus it has a valency of +2.
Thus;
Number of equivalents = 0.6 × 2
Number of equivalents = 1.2 eq
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