## Standard state

Grace Han 2K
Posts: 33
Joined: Tue Nov 15, 2016 3:00 am

### Standard state

How do you know if an element or compound is in its standard state? My notes says that while calculating standard rxn enthalpy, to make sure everything is in standard state and if it is not, take into account of phase change.

Britney Alvey 1B
Posts: 31
Joined: Fri Jun 23, 2017 11:39 am

### Re: Standard state

The standard state of an element is the state it is in at 25 $^{\circ}C$ and 1 atm of pressure.

RyanS2J
Posts: 32
Joined: Thu Jul 27, 2017 3:00 am

### Re: Standard state

Some examples that might be helpful are that carbon in its standard state is graphite, and certain elements (H, N, O, F, Cl, Br, I) exist in their diatomic forms at standard state (H2, N2, O2, F2, etc.).

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