Which of the following is not true for a mole?
Correct answer: D. It contains different numbers of particles for different substances
- A. It is a counting unit
- B. It represents the gram atomic or gram molecular mass of a substance
- C. It contains 6.022 x 10^23 particles (Avogadro's number)
- D. It contains different numbers of particles for different substances
Explanation
Option d is correct because moles represent a quantity of substance, and this quantity will differ for different substances due to their varying atomic and molecular weights.
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About Fundamental Concepts of Chemistry
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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