Using Heats of Formation
This page is designed to fulfil a number of purposes related to the use of formation heats to estimate reaction enthalpies. As with the other pages, it can generate problems for you to solve. Alternatively, you can use it to solve problems you find elsewhere. As your first step in using the page, you must select whether you want it to generate problems for you, by clicking on the checkbox below. If you have checked that you want the page to provide a problem, clicking on "Start" will cause one to appear in the top frame. Regardless of whether you have asked for a problem, the formation heat data is in the right frame. In using the data to solve a problem, use the following procedure:
- Identify all reactants and products and click on the appropriate checkbox.
- In the cell following the check boxes, enter the number of moles. If only one mole was affected, you do not need to enter a number.
- When all of the data is entered, you can check it by clicking on the "Check Input" button. A small window will appear with your data in it. This is merely for you to check your data. Errors need to be changed on the heat selection window.
- When you are satisfied with your input, press the "Submit" button. The result of your data input will appear in the main window. If you are doing a problem the page produced, you will also get the usual scoring on the main window.
- You may look at the overall reaction you have submitted by pressing the "Create" button. This will open a small window with the reaction you've created. This can be compared with the reaction you are trying to determine the enthaply of.