2 moles of octane (C8H18) burn with 25 moles of oxygen (O2) and produced _ moles of carbon dioxide along with 18 moles of water.
Correct answer: B. 16
- A. 14
- B. 16
- C. 18
- D. 2
Explanation
Since we know that 18 moles of water are produced alongside carbon dioxide. The correct option must be the one which balances the equation properly. The balanced equation for combustion of octane is:2 C8H18 + 25 O2 -> 16 CO2 + 18 H2OThus, the correct option is B.
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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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