Follow these steps to see how the example graph below is created.

Draw the y-axis with appropriate interval based on the data to show changes in potential energy and the x-axis to show the forward progression of the reaction. Label both axes accordingly.
Plot and label the potential energy of the reactants (−380 kJ), the transition state (Ea= –230 kJ), and the potential energy of the products (−570 kJ) using three horizontal dotted lines.
Draw a curve from the reactants dotted line up to the transition state line, and then curve the line down to the potential energy dotted line of the products.
Label the reactants and products with their chemical formulas and the hump as "Transition State."
Use double-headed arrows between the dotted lines of the products and reactants to label the total change in enthalpy (ΔH).
Use double-headed arrows between the dotted lines of the reactants and transition state to label the activation energy.
Subtract the potential energy of the reactants from the activation energy potential energy to determine the total activation energy needed for the reaction.
Subtract the potential energy of the reactants from the potential energy of the products to determine the change in enthalpy.

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

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