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The formula shows that each mole or formula unit contains one gram Atomic Mass of each of potassium and manganese and four gram atomic masses of oxygen. the gram atomic mass of potassium is 39.0983, that of manganese is 54.9380, and that of oxygen is 15.9994. Therefore, the required answer is:
2.47[39.0983 + 54.9380 + 4(15.9994)] or about 390 grams, to the justified number of significant digits.
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