Answer:The formula for hydroarsenic acid is H3AsO4.
Explanation: Hydroarsenic acid is a compound formed by the combination of hydrogen (H), arsenic (As), and oxygen (O). In this compound, there are three hydrogen atoms, one arsenic atom, and four oxygen atoms.
The formula H3AsO4 indicates that there are three hydrogen atoms, one arsenic atom, and four oxygen atoms in each molecule of hydroarsenic acid. The subscript numbers indicate the number of atoms of each element present in the compound.
It is important to note that hydroarsenic acid is a highly toxic compound and should be handled with extreme caution. It is commonly used in the production of certain chemicals and pesticides.