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### Hess's Law

Posted: Sat Jan 25, 2020 11:35 pm
What is this and what can you do with this?

### Re: Hess's Law

Posted: Sat Jan 25, 2020 11:48 pm
Basically what Hess's Law says is that enthalpy changes can be additive, mainly because enthalpy is a state property. For a reaction at given temperature and pressure, the enthalpy change of the reaction remains the same no matter how many times you conduct the reaction. So if you know the enthalpy changes for two reactions, then you will know the total change of enthalpy if the two reactions happen together simply by adding them together because enthalpy changes can be additive.

Hope this can help! =_-

### Re: Hess's Law

Posted: Sun Jan 26, 2020 12:15 am
What Hess's law states is that because enthalpy is a state function, enthalpies of reaction can be added together. This means when two or more chemical reactions are added together to get a net reaction, you can get the net enthalpy of reaction by adding the separate enthalpies of reaction of the combined chemical reactions, if that makes sense. 0.0

### Re: Hess's Law

Posted: Sun Jan 26, 2020 1:04 am
Hess's law states that the total enthalpy change during the complete course of a chemical reaction is the sum of its parts. Basically, it's stating that enthalpy can be added.

### Re: Hess's Law

Posted: Sun Jan 26, 2020 1:04 am
Hess's law states that the total enthalpy change during the complete course of a chemical reaction is the sum of its parts. Basically, it's stating that enthalpy can be added.

### Re: Hess's Law

Posted: Sun Jan 26, 2020 1:19 am
Hess' law states that enthalpy is a state function which also means that it is additive, meaning 2 or more chemical reactions can be added together.

### Re: Hess's Law

Posted: Sun Jan 26, 2020 11:42 am
Two or more reactions can be added together

### Re: Hess's Law

Posted: Sun Jan 26, 2020 12:03 pm
hess's law is basically stating that because enthalpy is a state function, enthalpy is additive. you can simply add the enthalpies of reactions; regardless of how many steps a reaction has, the total enthalpy change is just the sum of all changes