5 posts • Page 1 of 1
It will probably be stated in the question and only one of these will probably be given to you to solve a problem. If both are given, you may need to combine the two methods or choose to do either method if the problem can be solved like that
The difference between reaction enthalpy and enthalpy of formation relies on the info given. Reaction enthalpy would require the use of Hess's Law, but in order to execute Hess's Law, you must know/ be given the total change in enthalpy a specific reaction produces. Typically this is given to you in a chart, or next to the problem where you can then use Hess's law. Enthalpy of formation requires info on the specific formation of an individual molecule, for example N2 or CO2. Typically, molecules exothermically change in enthalpy in order to form the molecule, providing you the information necessary to add up all the specific formations of each molecule in the reactants and products. However, it is worth noting that molecules like N2 do not have formation enthalpies because in nature, N2 occurs naturally where as N does not occur alone.
Who is online
Users browsing this forum: No registered users and 1 guest