Chapter 27. Chapter 27

Problem-Solving Video Assessment

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Chapter 27 Problem-Solving Video Assessment

Some specialized bacteria can oxidize the hydrocarbons in petroleum for energy, specifically octane (C₈H₁₈, molecular weight = 114.23 g/mole). This is especially useful for cleaning up oil spills.

1.

How many moles of oxygen are required for the complete oxidation of 1 mole of octane by these bacteria?

8.5 moles

12.5 moles

17 moles

25 moles

34 moles

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

2.

How many moles of octane are present in 400,000 kg of spilled octane, or roughly 1% of the size of an average oil spill?

0.0035 mole

3.5 moles

45,692 moles

3.5 x 10⁶ moles

4.6 x 10¹⁰ moles

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

3.

How many moles of fresh water will these bacteria produce if all 400,000 kg of spilled octane are fully oxidized?

31.5 moles

388,889 moles

3.2 x 10⁷ moles

6.3 x 10⁷ moles

4.1 x 10¹¹ moles

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

4.

How many liters of fresh water are produced after complete oxidation of the octane (molecular weight of water = 18 g/mole; density = 1 g/mL)?

0.57 liters

1778 liters

576,000 liters

1.1 x 10⁶ liters

5.8 x 10⁸ liters

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

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Chapter 27. Chapter 27

Introduction

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