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https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/17%3A_Thermochemistry/17.15%3A_Hess's_Law_of_Heat_Summation 17.15: Hess's Law of Heat Summation - Chemistry LibreTexts Mar 14, 2025 - This page explains the complexities involved in calculating the energy associated with operating an acetylene torch. It highlights the use of Hess's law to... law of heathesssummationchemistrylibretexts