standard enthalpy change of formation of H2O

why there appear

standard enthalpy change of formation of H2O(g)<-gas?

what is the state of H2O at 25oC?

更新:

so standard condition does not mean measureat 25oC?

1 個解答

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  • Amy
    Lv 5
    1 十年前
    最愛解答

    The standard enthalpy change of reaction is the enthalpy change that occurs in a system when 1 equivalent of matter is transformed by a chemical reaction under standard conditions.

    A common standard enthalpy change is the standard enthalpy change of formation, which has been determined for a vast number of substances. The enthalpy change of any reaction under any conditions can be computed, given the standard enthalpy change of formation of all of the reactants and products. Other reactions with standard enthalpy change values include combustion (standard enthalpy change of combustion) and neutralisation (standard enthalpy change of neutralisation).

    standard enthalpy change of H2O gas is -241.8 kJ/mol

    state of H2O at 25*C is liquid

    資料來源: wikipedia
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