In the balanced equation for the combustion of pentane, C₅H₁₂(g) + _ O₂(g) → 5CO₂(g) + 6H₂O(l), the coefficient of the oxygen should be:
Correct answer: D. 8
- A. 16
- B. 12
- C. 11
- D. 8
Explanation
After balancing carbon (5CO₂) and hydrogen (6H₂O), the product side has (5×2) + 6 = 16 oxygen atoms. To get 16 oxygen atoms from diatomic O₂, the coefficient must be 8.
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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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