When 8 grams (4 moles) of H2 react with 2 moles of O2, how many moles of water will be formed?
Correct answer: B. Four
- A. Five
- B. Four
- C. Six
- D. Three
Explanation
2H₂ + O₂ → 2H₂OThis equation indicates that 2 moles of hydrogen (H₂) react with 1 mole of oxygen (O₂) to produce 2 moles of water (H₂O). You have 4 moles of H₂ and 2 moles of O₂. Since 2 moles of O₂ are available, they will react completely with 4 moles of H₂. Thus, when 8 grams (4 moles) of H₂ react with 2 moles of O₂, you will produce 4 moles of water (H₂O).
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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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