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The combustion of propane (C 3H 8) in the presence of excess oxygen yields CO 2 and H 2O: C 3H 8 (g) + 5O 2 (g) → 3CO 2 (g) + 4H 2O (g) When 2.5 mol of O 2 are consumed in their reaction, ________ mol of CO 2 are produced.

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Answer:

1.5 mol of COâ‚‚

Explanation:

Use the mole ratio to find how many moles of COâ‚‚ are produced from the reaction.

For every 5 moles of Oâ‚‚, three moles of COâ‚‚ is produced.

2.5 mol O₂ × 3 mol CO₂ ÷ 5 mol O₂

= 2.5 mol O₂ × 0.6

= 1.5 mol COâ‚‚

When 2.5 mol of Oâ‚‚ is consumed in the reaction, 1.5 mol of COâ‚‚ is produced.

Hope that helps.

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