The formula unit Ba(NO3)2 contains 6 oxygen atoms. (Multiply the subscript 3 in the nitrate ion by the subscript 2 after the parentheses close.)
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There is one oxygen atom in each unit of the compound Ba(OH)2.
There are three oxygen atoms present in a formula unit of barium nitrate (Ba(NO3)2).
There are three oxygen atoms in one molecule of barium hydroxide, which has the chemical formula Ba(OH)2.
There are 12 oxygen atoms in a formula unit of barium perchlorate because each perchlorate ion (ClO4-) contains four oxygen atoms, and there are three perchlorate ions in each formula unit of barium perchlorate (Ba(ClO4)2).
There are 2 oxygen atoms in 1 molecule of oxygen.