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In the formula for water (H20), what does the lack of a subscript after the 0 indicate?

User Damnever
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The lack of a subscript on the O means there is only one oxygen atom in the water molecule/compound. 
User Oliver Tynes
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The lack of a subscript after the 0 means that there is only one oxygen (0).

There are 2 hydrogen molecules and 1 oxygen molecules

hope this helps
User Green Marker
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