Methods of Enthalpy

[Michael Lee 2I]

Are we going to have to use more than one method of finding the enthalpy in any problem?

[Swetha Sundaram 1E]

I think we have to use different methods depending on what we're given in the problem.

[ConnorThomas2E]

I think that he will give you a problem and based on the information he gives you, you will have to use a certain method to find the enthalpy. So I would make sure to know the various methods to calculate the enthalpy.

[Dylan Mai 1D]

There are 3 methods we know of right now correct?

[Varsha Sivaganesh 1A]

There are 3 methods we know of right now correct?

Yes! The first method is using Hess's method, the second is using bond enthalpies, and the third is using standard enthalpies of formation. So it just depends on what information the question gives you.

[Susie Lee 2I]

Hess's Law (method 1) is a state function, which means it must be additive. The enthalpy change at each step of a multi-step reaction can be added to give the total enthalpy change. Bond enthalpies (method 2) are always positive and endothermic. The reactants (bonds broken) require energy, and the products (bonds formed) release energy.

[Naana Boateng 1I]

Possibly, it depends on the type of question that Lavelle puts on his test, and whether or not there will be an A, B or C. Just be prepared for anything at this point.

[aaron tang 2K]

It honestly depends on the question because there are 3 methods of enthalpy. 1. Hess' Method 2. Bond Enthalpies 3. Standard Enthalpies of Formation

[AnuPanneerselvam1H]

Yes we learned three methods. The first one involves Hess's Law, the second one uses bond enthalpies, and the third one uses standard enthalpies of formation. The method you use depends on the information given.