All of the following statements are incorrect for 20 moles of water except:
Correct answer: B. It contains 40 moles of hydrogen atoms
- A. It contains 80 moles of atoms
- B. It contains 40 moles of hydrogen atoms
- C. It contains 30 moles of electrons
- D. It contains 30 moles of oxygen atoms
Explanation
In 20 moles of water (H₂O), there are 20 × 2 = 40 moles of hydrogen atoms and 20 × 1 = 20 moles of oxygen atoms. Therefore, the only correct statement is that it contains 40 moles of hydrogen atoms.
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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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