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For reasons we will discuss in class, it turns out that a way we can calculate the enthalpy change for a reaction is by summi

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Enthalpy of formation is zero for most stable elementary form of substance

PH af No= 90.29 kJ/mol Auf af Oz → zero Shf of NO2 → 33.18 kJ Chem = E shfil products – Esmf Creactoard) 219 g) + O2(g) — 216

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