Which of the following compounds has an empirical formula but no molecular formula?
Correct answer: D. NaCl
- A. H₂O
- B. C₆H₆
- C. H₂O₂
- D. NaCl
Explanation
The term "molecular formula" applies to substances made of discrete molecules. Ionic compounds like NaCl exist as a crystal lattice, so they are represented by an empirical formula (formula unit) but not a molecular formula.
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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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