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# thermo - Exam 3 Thermodynamics Review FIRST LAW OF...

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Exam 3 – Thermodynamics Review FIRST LAW OF THERMODYNAMICS Energy cannot be created or destroyed E q w ∆ = + E is a state function meaning that only the final and initial positions are important. Heat and work are NOT state functions. What does this mean? +q heat is absorbed by the system -q heat is released by the system +w work is done on the system by surroundings -w work is done by the system on the surroundings Paths Against a constant pressure ext W P V = - If an ideal gas expands against a constant external pressure of 1.20 atm from a volume of 20.0 L to a volume of 50.0 L. During the expansion, the gas absorbs 2500 J of heat. Determine E . (Remember conversion factor!) Expansion Work reversible, isothermal 2 1 ln V W nRT V = - What is the maximum work done when 1.00 moles of gas expands from 1.00 L to 10.0 L at a constant temperature of 25 o C? Other Descriptions of Energy Change V E nC T ∆ =

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ENTHALPY We know that under isobaric conditions p E q W ∆ = + We define change in enthalpy as the amount of heat released or absorbed during a
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thermo - Exam 3 Thermodynamics Review FIRST LAW OF...

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