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    The thermochemical standard state of a substance is its most

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    16. Which of the following statements is incorrect?
    A.The thermo chemical standard state of a substance is its most stable state under one atmosphere pressure and at some specific temperature (298 K if not specified)
    B.A superscript zero, such as H0, indicates a specified temperature of 0C.
    C.For a pure substance in the liquid or solid phase, the standard state is the pure liquid or solid.
    D.For a pure gas, the standard state is the gas at a pressure of one atmosphere.
    E. For a substance in solution, the standard state refers to one-molar concentration.

    17. Fuel values of hydrocarbons increase as the H/C atomic ratio increases. Which of the following compounds has the highest fuel value?
    A.C2H6
    B.C2H4
    C.C2H2
    D.CH4
    E.C6H6

    18. Calculate H° (in kJ) for reaction 3 is __________ kJ.

    A.196
    B.-196
    C.1087
    D.-1384
    E.-543

    19. When we put 100-g piece of metal at 100°C into 100 g of water at 20°C, the final temperature is 60°C.

    20. With reference to enthalpy changes, the term standard conditions means __________.
    A.a only
    B.b only
    C.c only
    D.a and c
    E.a and b

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    https://brainmass.com/chemistry/physical-chemistry/thermochemical-standard-state-substance-most-101238

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    16. Which of the following statements is incorrect?
    A.
    The thermochemical standard state of a substance is its most stable state under one atmosphere pressure and at some specific temperature (298 K if not specified)
    B.
    A superscript zero, such as H0, indicates a specified temperature of 0C. Incorrect, normally means ...

    Solution Summary

    The solution provides detailed explanations and answer for the problem. Thermochemical standard states for the atmosphere is determined.

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