Homework Help: Chemsitry

Posted by Anonymous on Monday, February 25, 2008 at 5:31pm.

Which of the following is NOT true about the thermodynamic standard state?

A. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C.
B. An aqueous solution is in its standard state at a concentration of 1.00 M.
C. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C.
D. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm.
E. All of these are true.

Chemsitry - DrBob222, Monday, February 25, 2008 at 5:33pm
Look up the standard state definition of a liquid (answer D) and see if the standard state of a liquid has a vapor pressure of 1.00 atm.
Chemsitry - Anonymous, Monday, February 25, 2008 at 5:38pm
ive looked in my book and cant seem to find it
Chemsitry - Anonymous, Monday, February 25, 2008 at 5:54pm
i got it thanks
Chemsitry - DrBob222, Monday, February 25, 2008 at 6:05pm
Look under Thermochemical standard state in the index. Or try Thermodynamic standard state.
My FRESHMAN chemistry text has the following listed under thermochemical standard states.
From Whitten, Davis, Peck, General Chemistry, 5th edition, page 554.
"Keep in mind the following conventions for thermochemical standard states.
1. For a pure substance in the liquid or solid phase, the standard state is the pure liquid or solid.

2. For a gas, the standard state is the gas at a pressure of one atmosphere; in a mixture of gases, its partial pressure must be one atmosphere.

3. For a substance in solution, the standard state refers to one-molar concentration.?

At an earlier part of the paragraph, it lists the standard T for the standard state as 25 C.
I hope this helps.
- Chemsitry - DrBob222, Monday, February 25, 2008 at 6:21pm
  Did you retry the 548 kJ/mol again. I'd like to know if that was the trouble.
Chemsitry - many bunnies in UCI, Wednesday, February 17, 2010 at 5:54am
-548 kJ/mol
Chemsitry - Anonymous, Sunday, May 15, 2011 at 8:39pm
D. I just did it.

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