Solved Name Date Chemistry - Unit 4 Worksheet 2 Avogadros | Chegg.com - Free Printable

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- The chemical formula H₂O tells us that each molecule of water is composed of two hydrogen atoms (H) and one oxygen atom (O).
- The subscript "2" after the H indicates that there are two hydrogen atoms bonded to a single oxygen atom in each water molecule.
- This composition reflects the stoichiometry of the reaction: two molecules of hydrogen gas (H₂) react with one molecule of oxygen gas (O₂) to form two molecules of water (H₂O), conserving the number of atoms.
- Therefore, the formula H₂O precisely describes the atomic makeup of a water molecule based on experimental evidence and the law of definite proportions.

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