## Standard State

Amy Dao 3K
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Standard State

On page 20 of the course reader it says make sure everything is in standard state and that the reaction is balanced. I'm a little confused to as what it means by standard state?

Ryan McDonough 4E
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

### Re: Standard State

Hi Amy. Standard state is when a substance is at its lowest energy due to the state of matter it's in. For example, the reaction in the book, CH4(g) + 2O2(g) --> CO2(g) +2H2O(l), shows us that the standard state of the first three compounds is gas. This means that these compounds are at their lowest energy when they are in a gaseous state. However, water is at its lowest energy when it's in liquid form. Hope this helps!

Lily Wei 1D
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

### Re: Standard State

The standard state of something is just the most stable state of matter of a substance at 25 degrees Celsius and 1atm :)

Shaye Busse 3B
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Re: Standard State

The standard states of elements are when they are in their most stable natural form at 25 degrees Celsius and 1 atmosphere of pressure as well as 1 mole of the molecule. For some elements, (Br, N, Cl, H, O, and F) the most stable natural form is a diatomic molecule.

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