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I was told that the standard enthalpy of a reaction is the enthalpy change when the reaction occurs with all reactants and products being in there standard states and under standard conditions(1 bar pressure for gases and 1molar concentration for solutions),but when we say 1 bar pressure for gases,do we mean that the partial pressure of each of the gaseous reactants and products is 1 bar,or that the total pressure of the reactants and products combined is 1 bar?

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    – andselisk
    Commented Aug 26, 2023 at 18:12

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