100608 - What is the change in internal energy for the...

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Work y A force acting over a distance y Dependent on the path chosen, the sign of work is viewed from the point of view of the system.
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PV Work: Expansion
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PV Work y Consider a gas at P gas = 6.0 atm and V = 400 mL in a cylinder with a moveable piston. The gas is allowed to expand to 1.5 atm at constant temperature. How much work is done?
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Heat y Heat- the transfer of energy between two objects, not a form of energy y Endothermic- energy flows from the surroundings to the system y Exothermic- energy flows from the system to the surroundings y Calorie- the heat requires to raise the temperature of one gram of water by one degree Celsius = 4.184 J
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First Law of Thermodynamics y The energy of the universe is constant.
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Internal Energy y The gas in a piston is warmed and absorbs 655 J of heat. The volume of the container expands from 5.6 L to 9.0 L at 1 atm of pressure.
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Unformatted text preview: What is the change in internal energy for the system? Enthalpy y Enthalpy- heat content of a reaction or compound, the thermodynamic potential of a system Endothermic vs Exothermic Is water freezing in a freezer an exo- or endo- thermic process? e x o thermic ndothermic 23% 77% 1. exothermic 2. endothermic Is sweat evaporating an exo- or endo-thermic process? e x o thermic ndothermic 79% 21% 1. exothermic 2. endothermic Enthalpy of Reaction H N 2 + O 2 2NO 180.75 kJ Rx Enthalpy of Reaction H N 2 O + O 2 2NO-99.20 kJ Rx Thermochemical Equations y Ammonia reacts with oxygen to form NO and water vapor, the enthalpy for the reaction is -906 kJ. Calculate the heat (in kJ) associated with the complete reaction of 155 g of ammonia....
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This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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100608 - What is the change in internal energy for the...

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