Chapter 6 - Thermodynamics_Part4

Chapter 6 - Thermodynamics_Part4 - GENERAL CHEMISTRY...

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GENERAL CHEMISTRY CHAPTER 6 – THERMODYNAMICS PAGE 13 OF 16 Example : Prove that ∆H = q at constant pressure Example : A balloon filled with 39.1 moles of helium has a volume of 876 L at 0.0 o C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0 o C as it expands to 998 L. The pressure remains constant. Calculate q, w, E, and H for the helium in the balloon. The molar heat capacity for helium gas is 20.8 J/mol o C.
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GENERAL CHEMISTRY CHAPTER 6 – THERMODYNAMICS PAGE 14 OF 16 Standard Conditions Standard state = the state of a material at a defined set of conditions Pure gas at exactly 1 atm pressure Pure solid or liquid in its most stable form at exactly 1 atm pressure and temperature of interest ( Usually 25°C Substance in a solution with concentration 1 M Standard enthalpy change ( H°) = the enthalpy change when all reactants and products are in their standard states Standard enthalpy of formation ( H f °) = the enthalpy change for the reaction forming 1 mole of a pure
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Chapter 6 - Thermodynamics_Part4 - GENERAL CHEMISTRY...

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