This matter of ?H being dependent on physical state and molar concentration means that thermochemical equations must be stoichiometrically correct.
2.
Assume that one needs to multiply " A " by two in order to use the thermochemical equation ( as in addition, below ).
3.
If one agent of the equation is changed through multiplication, then all agents must be proportionally changed, including ?H . ( See Manipulating Thermochemical Equations, below .)
4.
In other words, it does not matter what steps we take to get from initial reactants to final products the ?H will always be the same . ?Hrxn, or the change in enthalpy of a reaction, has the same value of ?H as in a thermochemical equation, but is in units of kJ / mol being that it is the enthalpy change per moles of any particular substance in the equation.
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