Chemsitry

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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 -

    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 -

    ive looked in my book and cant seem to find it

  • Chemsitry -

    i got it thanks

  • Chemsitry -

    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 -

    Did you retry the 548 kJ/mol again. I'd like to know if that was the trouble.

  • Chemsitry -

    -548 kJ/mol

  • Chemsitry -

    D. I just did it.

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