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mg = (mEq • atomic, molecular or formula weight) / valence
Atomic weight of potassium [K] is 39.0983
Atomic weight of chlorine [Cl] is 35.453
The molecular weight of potassium chloride [KCl] is sum of the atomic weights above: 74.551 (rounded)
The valence of potassium chloride is 1
Thus:
(20mEq potassium chloride • 74.551) / 1 = 1491.0 mg potassium chloride
Which breaks down to 781.960 mg of elemental potassium [K], and 709.060 mg of elemental chlorine [Cl].
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