# 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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###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Internal Energy concept. You can view video lessons to learn Internal Energy. Or if you need more Internal Energy practice, you can also practice Internal Energy practice problems.

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Based on our data, we think this problem is relevant for Professor Hutchinson's class at RICE.