The empirical formula for water is
Correct answer: D. H2O
- A. CO2
- B. HO
- C. H2
- D. H2O
Explanation
The empirical formula for water is H2O, which indicates that each molecule of water consists of 2 hydrogen atoms bonded to 1 oxygen atom. This is the simplest whole number ratio of atoms in the molecule, making it both the empirical and the molecular formula for water. The other options represent different substances: CO2 is carbon dioxide, HO represents a hydroxide ion (not a neutral compound), and H2 is hydrogen gas.
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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