What is the chemical formula of water?

  1. CO2
  2. H2O
  3. O2
  4. NaCl

Correct answer: B

Water has the chemical formula H2O, meaning each water molecule contains two hydrogen atoms and one oxygen atom. CO2 is carbon dioxide, O2 is molecular oxygen, and NaCl is sodium chloride or common table salt. Chemical formulas identify the types and ratios of atoms in substances.
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Category: General Science

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