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Energy Content of Fuels

Figure from experiment 17 from Chemistry with Vernier


In this experiment, you will find and compare the heat of combustion of two different fuels: paraffin wax and ethanol. Paraffin is a member of a group of compounds called alkanes that are composed entirely of carbon and hydrogen atoms. Many alkanes, such as gasoline and diesel oil, are important fuels. Ethanol, C2H5OH, is used as a gasoline additive (gasohol) and as a gasoline substitute. In this experiment, you will compare the energy content of paraffin and ethanol by measuring their heats of combustion in kJ/g of fuel.

In order to find the heat of combustion, you will first use the energy from burning ethanol or paraffin to heat a known quantity of water. By monitoring the temperature of the water, you can find the amount of heat transferred to it, using the formula

q = C_p \cdot m \cdot \Delta t

where q is heat, Cp is the specific heat capacity of water, m is the mass of water, and Δt is the change in temperature of the water. Finally, the amount of fuel burned will be taken into account by calculating the heat per gram of fuel consumed in the combustion.


In this experiment, you will

  • Compare the heat of combustion for paraffin wax and ethanol.
  • Calculate the heat of combustion and percent efficiency for both fuels.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Chemistry with Vernier »

Experiment 17 from Chemistry with Vernier Lab Book

<em>Chemistry with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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