Concept explainers
Interpretation:
The quantity of energy released by 25.2 billion barrels of oil should be calculated.
Concept Introduction:
Oil can be converted to gasoline. Pure gasoline contains octane. Combustion of octane produces carbon dioxide and water vapor. Energy is also released during the combustion of octane.
Answer to Problem 9.101PAE
Solution:
Explanation of Solution
1 barrel of oil can produce 19.5 gallons = 73815.5 mL of gasoline
We know, 1 gallon = 3785.41 mL
Therefore, 19.5 gallons
25.2 billion or 25,200,000,000 barrels of oil can produce
[Since, 1 billion = 1,000,000,000]
Gasoline contains pure octane with a density of 0.692 g/mL.
Mass of octane in
Moles of octane in
The balanced chemical equation for the combustion of octane is as follows:
From Hess’s law, we know,
Change in enthalpy in a chemical reaction
Change in enthalpy for the combustion of one-mole octane
Change in enthalpy during combustion of
Therefore,
The quantity of heat energy released by 25.2 billion barrels of oil has been calculated.
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Chapter 9 Solutions
Chemistry for Engineering Students
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