When pentane C5H12 is burned in excess of oxygen, the products of the reaction are CO2(g) and H2O (l). In the balanced equation for this combustion, C5H12(g) + O2 (g) → 5CO2(g) + 6H2O (l) the coefficient of oxygen should be:
Correct answer: D. 8
- A. 16
- B. 12
- C. 11
- D. 8
Explanation
Using the POAC method, the balanced equation will be:C5H12 + 8O2 → 5CO2 + 6H2O∴ The coefficient of oxygen is 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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