
Concept explainers
Interpretation: The comparison between two fuels with the help of water is to be described.
Concept introduction: Combustion reactions are used to power vehicles, heat water and homes, and create electricity. But not all combustion reactions provide the same amount of energy.

Answer to Problem 1E
By increasing water temperature equate fuels by taking same amount of water and same amount of fuel.
Explanation of Solution
To compare two fuels water is used to compare fuel. Equate fuels by taking same amount of water and same amount of fuel by increasing water temperature. To compare different fuels measure the amount of energy that they transfer as a result of combustion.
One other way to compare fuels is to calculate the number of kilojoules of energy per mole of fuel.
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