CHEM 154 Lecture Notes - Lecture 17: Petri Dish, Joule, Enthalpy
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If w = -p v, then w = 0. 10. 1 kj c: +10. 1 kj, none of the above. Answer: d: a certain chemical reaction absorbs 10. 1kj of heat under . Constant volume conditions and absorbs 8. 4 kj of heat under . Conditions. what is: the sublimation of dry ice is described by the following reaction: (we"re doing this at constant pressure) q=mc t . Enthalpy is the heat at a constant pressure. Enthalpy (h) =heat released/absorbed during chemical reaction enthalpy has units of joules (j) or kilojoules(kj). Heat is required to overcome imfs, or. Heat is released upon the formation of imf"s. H phase change n= number of moles of substance. H is an extensive property. therefore it scales with size/quantity/extent. How can we measure the enthalpy of reactions that are very slow? (or don"t happen at all?) H overall = h1 + h2: reversing reaction inverts sign of h.
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