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Average Kinetic Energy of a Molecule

Average Kinetic Energy of a Molecule

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Average Kinetic Energy of a Molecule

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  1. Average Kinetic Energy of a Molecule Thermal Physics Lesson 7

  2. Learning Objectives • Derive an expression to calculate the average kinetic energy of a molecule.

  3. Mean kinetic energy The mean kinetic energy of a molecule is the total kinetic energy of all the molecules/total number of molecules. The root mean square speed is defined as: …and so the mean kinetic energy of one molecule is gvien by…

  4. Mean Kinetic Energy Note we have two equations with pV on the left hand side. (N=nNA) The Boltzmann constant, k, is defined as R/NA.

  5. Mean Kinetic Energy Multiply both sides by 3/2. Mean kinetic energy of a molecule of an ideal gas. Kinetic energy of one mole of gas (because R=NAk) Kinetic energy of n moles of gas.