Answer
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Step 1:: To write the chemical formula for water, we need to know that water is composed of two hydrogen atoms (H) and one oxygen atom (O).
Step 2:: Chemical formulas are written with the symbols for the element and subscripts indicating the number of atoms of each element in a molecule.
In this case, there are two hydrogen atoms and one oxygen atom in a water molecule.
Step 3:: Therefore, the chemical formula for water is:
\mathrm{H}_2\mathrm{O}
Step 4:: Water vapor is simply water in its gaseous state, so the chemical formula for water vapor is the same as that for liquid water:
\mathrm{H}_2\mathrm{O}
Final Answer
The formula for water vapor is extrm{H}_2 extrm{O}.
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