Problem: DO NOT FORGET TO WRITE A BALANCED CHEMICAL EQUATION!! The combustion of one mole of octane (C8H18(l)) to produce carbon dioxide and liquid water has ∆Hr = −5471 kJ · mol−1 at 298K. What is the change in internal energy for this reaction? 1. −5460 kJ · mol−1 2. −5493 kJ · mol−1 3. −5471 kJ · mol−1 4. −5449 kJ · mol−1 5. −5482 kJ · mol−1

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DO NOT FORGET TO WRITE A BALANCED CHEMICAL EQUATION!!

The combustion of one mole of octane (C8H18(l)) to produce carbon dioxide and liquid water has ∆Hr = −5471 kJ · mol−1 at 298K. What is the change in internal energy for this reaction?

1. −5460 kJ · mol−1

2. −5493 kJ · mol−1

3. −5471 kJ · mol−1

4. −5449 kJ · mol−1

5. −5482 kJ · mol−1