Which of the followings does not represent the empirical and molecular formula of the same compound?
Correct answer: B. NaCl
- A. H2O
- B. NaCl
- C. HCHO
- D. CH4
Explanation
Sodium chloride (NaCl) does not have a molecular formula in the traditional sense because it is an ionic compound, not a molecular compound. In ionic compounds, the bonding occurs through the transfer of electrons between atoms, leading to the formation of ions. So molecular formula cannot be written for ionic compounds like NaCl.So option B is the correct answer.
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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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