The chemical formula for sulfuric acid is \( \text{H}_2\text{SO}_4 \).
From this formula, we can determine the following:
1. **Number of molecules of sulfuric acid**: The question seems to ask for the number of molecules in a formula unit of sulfuric acid, which is one. So the answer here is **1 molecule**.
2. **Number of hydrogen atoms**: The formula \( \text{H}_2\text{SO}_4 \) indicates there are **2 hydrogen atoms**.
3. **Number of sulfur atoms**: There is **1 sulfur atom** in the formula \( \text{H}_2\text{SO}_4 \).
4. **Number of oxygen atoms**: There are **4 oxygen atoms** in sulfuric acid.
Now, to find the total number of atoms in one molecule of sulfuric acid, we add the number of hydrogen, sulfur, and oxygen atoms together:
- Hydrogen: 2
- Sulfur: 1
- Oxygen: 4
Total = \( 2 + 1 + 4 = 7 \) atoms.
In summary, the filled blanks would be:
- **1** molecules of sulfuric acid
- **2** hydrogen atoms
- **1** sulfur atom
- **4** oxygen atoms
- Total of **7** atoms in this substance.