How many phosphorous atoms are found in three molecules of magnesium phosphate, 3mg3(po4)2

6

Explanation:

One molecule of magnesium phosphate, Mg₃(PO₄)₂, contains 2 phosphorus atoms, because P is contained between the brackets followed by a subscripted 2. If in one molecule of magnesium phosphate there are two phosphorus atoms, then in three molecules there are 3 * 2=6 phosphorus atoms.

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