Standard conditions vs STP clarification

[arc5005]

this is related to a post I had made regarding a Dry Box Gas Law Question from the TBR books 2016 edition.

Can I get some clarification on this please:

Standard State = Standard Conditions = 25 C, 1.00 atm, 1 M

STP = 0 C and 1.00 atm

Is this correct?

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[Doogie.Howser]

In chem, we need to have standards which to work from. Look at the tables published in your chem text and notice that it's most likely published at a specific temperature (25 C). For thermodynamics, G, S and H all change with temperature. Imagine if there wasn't any standards used and thousands of tables had to be published for every delta G, S and H.. So, in comes standards to allow us to work from.

Standard state is used for thermodynamics. The conditions you mentioned are the proper conditions, too. (An important reminder, deltaG std DOES NOT equal deltaG).

STP is standard temperature and pressure. There are different publications for what STP is, but according to IUPAC I believe its 0C and 10^5 Pa. I would look up what your MCAT study books call STP and run with those values.