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Thermodynamics

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

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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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