## Method One (Hess’s Law)

Drew Myers 4G
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

### Method One (Hess’s Law)

Can someone give a quick explanation of how to use Hess’s Law?

Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

### Re: Method One (Hess’s Law)

Hess's Law states that enthalpy changes are additive. Thus, the enthalpy change at each step of a multi-step reaction can be added to give the total enthalpy change. ex: delta Hrxn1 + delta Hrxn2= delta Hnet (adding reactions to obtain net reaction).

505316964
Posts: 95
Joined: Thu Jul 11, 2019 12:17 am

### Re: Method One (Hess’s Law)

If you have two equations that can be added together to get the wanted composite equation, you can add the deltaHRXN of each equation to get the net deltahHRXN.

smurphy1D
Posts: 51
Joined: Mon Nov 18, 2019 12:18 am

### Re: Method One (Hess’s Law)

Are the equations we add together ones we have to put together ourselves or will they usually be given?

Alice Chang 2H
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am