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Hess's Law and Reaction Enthalpy Change http://www.khanacademy.org/video/hess-s-law-and-reaction-enthalpy-change ----------------------------------------------------- يتناول هذا الفيديو حل امثلة حول المحتوى الحراري للتفاعل ------------------------------------------------------ شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org