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Boyle's Law

Boyle's Law. For a fixed amount of gas at constant temperature, pressure is inversely proportional to volume. Boyle’s Law tells us that PV must be constant. Charles’s Law. For a fixed amount of gas at constant pressure, volume is directly proportional to temperature. Ideal Gas Law.

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Boyle's Law

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  1. Boyle's Law For a fixed amount of gas at constant temperature, pressure is inversely proportional to volume.

  2. Boyle’s Law tells us that PV must be constant.

  3. Charles’s Law For a fixed amount of gas at constant pressure, volume is directly proportional to temperature.

  4. Ideal Gas Law Note: Avogadro's Law: volume increases linearly with n (T, V constant) Relation to molar mass (M):

  5. Partial Pressures Gas component 1 in the mixture has a mole fraction (x): The partial pressure of component 1 in the mixture (P) is:

  6. Expansion of an Ideal Gas Pext = 1 atm Pext = 1 atm REMOVE PINS Dx pins P = 1 atm Irreversible Expansion P = 2 atm The work done is • w is negative for expansion (the gas does work on the “surroundings”) • w is positive for compression (the “surroundings” does work on the gas)

  7. Kinetic Theory of Gases • Volume of particles assumed negligible • Pressure caused by collisions on wall • Particles in constant motion • No intermolecular interactions • Kinetic energy proportional to temperature • Collisions are are elastic Each particle has a velocity given by:

  8. Some Important Results For rates of effusion

  9. Collisions With container walls Intermolecular Mean free path (learn the proof for this one)

  10. Real Gases Molar volume is volume divided by moles, and is inversely related to density • At lowP particles attract so molar volume of real gas < molar volume of ideal gas • At highP particles repel so molar volume of real gas > molar volume of ideal gas

  11. Intermolecular Interactions The Lennard-Jones Potential Repulsion/attraction cancels out repulsion Potential Energy Intermolecular separation 0 attraction Long-range attraction (negative) Short-range repulsion (positive) Attractive interactions include dipole-dipole, dipole-induced dipole, and London dispersion interactions The van der Waals equation of state takes into account excluded volume due to the finite size of particles, and a weak intermolecular attraction interaction.

  12. Equilibrium

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