The chemical formula \( \text{H}_2\text{PO}_4^- \) (which you likely meant with "2HPO") represents the dihydrogen phosphate ion. To count the total number of atoms in this formula, we can break it down:
- \( \text{H} \): 2 atoms of hydrogen
- \( \text{P} \): 1 atom of phosphorus
- \( \text{O} \): 4 atoms of oxygen
Adding these together gives a total of:
\[ 2 , (\text{H}) + 1 , (\text{P}) + 4 , (\text{O}) = 7 \text{ atoms} \]
So, the total number of atoms in \( \text{H}_2\text{PO}_4^- \) is 7.
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