Explanation: Chemical symbols and formulas are essential in chemistry to represent elements and their compounds. Each element has a unique symbol, and these symbols are used to write the formulas of compounds. The formula H2O is the molecular formula for water, which is a compound consisting of hydrogen and oxygen atoms.
In the formula H2O:
- The "H" stands for hydrogen, an element with the atomic number 1.
- The "O" stands for oxygen, an element with the atomic number 8.
- The subscript "2" next to the "H" indicates that there are two hydrogen atoms in each molecule of water.
- The absence of a subscript next to the "O" indicates that there is one oxygen atom in each molecule of water.
Water is a vital compound for life on Earth and is essential in numerous biological and chemical processes. Understanding the chemical formula H2O is crucial for comprehending the structure and properties of water. It is important to note that the formula H2O is not interchangeable with other chemical formulas like CO2 (carbon dioxide) or CO (carbon monoxide), as these represent different compounds with distinct properties and compositions.
In summary, H2O is the correct chemical formula for water, representing a molecule composed of two hydrogen atoms and one oxygen atom. This formula is fundamental in chemistry and is widely recognized in various scientific and educational contexts.