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Enthalpy is defined
as the energy of reaction, or the heat energy associated with a
chemical change. Chemical Principles By Master & Slowinski says that
"For any reaction carried out directly at a constant pressure, the
heat flow is exactly equal to the difference between enthalpy of
products and that of the reactants", or: Qp = Hp - Hr = ?H Where Qp is
the heat flow at constant pressure, Hp is heat energy of products, and
Hr is the heat energy of the reactants.
To measure ?H given off, we must use this energy to heat something,
this will be water. This is assuming that all the heat produced by
combustion of fuel (?H) will equal the amount of heat absorbed by the
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