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Thermodynamics

Explore the study of energy in chemical and physical changes of matter, including the calculation of heat released in reactions and the use of bomb calorimetry for combustion reactions. Practice problems included.

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Thermodynamics

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  1. Thermodynamics • Study of the energy involved in chemical and physical changes of matter Q = m (Cp) (T)

  2. Most q(H) values are kJ/mol of substance; therefore we must take into consideration the # of kJ based upon the # moles that are reacting EX: 4Fe(s) + 3O2(g)  2Fe2O3(s) H = -1652 kJ • How much heat is released when 4.0 mol iron is reacted with excess oxygen? • How much heat is released when 1.0 mol Fe2O3 is produced? • How much heat is released when 1.0 g iron is reacted with excess oxygen? • How much heat is released when 10.0 g Fe and 2.0 g O2 are reacted?

  3. Bomb Caloriemtry • Usually used for combustion reactions • Constant Volume so q=Cp*T EX: The combustion of 0.1584 g benzoic acid increases the temperature of a bomb calorimeter by 2.540C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.)

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