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Ch 23: The First Law of ThermodynamicsWorksheetSee all chapters

# First Law of Thermodynamics

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Sections
Heat Equations for Special Processes & Molar Specific Heats
First Law of Thermodynamics
Work Done Through Multiple Processes
Cyclic Thermodynamic Processes
PV Diagrams & Work

Concept #1: The First Law of Thermodynamics

Practice: A gas in a cylinder expands from a volume of 0.10 m3 to 0.320 m3. Heat flows into the gas just rapidly enough to keep the pressure constant at 1.65×105 Pa during the expansion. The total heat added is 1.15×105J. What is the change in internal energy of the gas?

Practice: A gas in a cylinder held at a constant pressure 1.80×105 Pa expands from a volume of 1.2 m3 to 1.6 m3. The internal energy of the gas decreases from 4.40×105 J to 3×105 J. How much heat was transferred to the gas?

Concept #2: Alternate Equation of the First Law of Thermodynamics

Practice: The internal energy of a system decreases by 500 J, and 230 J of work is done on the system. What is the heat transfer into or out of this system?

Example #1: Calculating Work Done on Monoatomic Gas