Lecture 14.3- The Ideal Gas Law

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Section 14.3 Lecture for Honors & Prep Chemistry

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  • In this flask used to store liquid nitrogen, there are two walls with a vacuum in between.
  • Lecture 14.3- The Ideal Gas Law

    1. 1. Bellwork- 4L @ STP <ul><li>A balloon holds 4.0 liters of gas at STP. What will its volume be at 80  C? </li></ul><ul><li>Which gas law did you use to solve this problem? </li></ul><ul><li>How much gas is in the balloon? </li></ul>
    2. 2. <ul><li>The ideal gas constant ( R ) </li></ul><ul><li>R = 8.31 (L·kPa)/(K·mol) </li></ul><ul><li>OR </li></ul><ul><li>R = 0.0821 (L·atm)/(K·mol) </li></ul>The Ideal Gas Law PV = nRT
    3. 3. 14.5
    4. 4. 14.5
    5. 5. 14.5
    6. 6. 14.5
    7. 8. An IDEAL GAS is a gas that behaves according to the three assumptions of the Kinetic Molecular Theory & the gas laws. IDEAL GASES Constant, random motion Particles have insignificant volume Collisions are perfectly elastic Intermolecular forces & the “real” volume of particles will cause gases to deviate from ideal behavior.
    8. 9. <ul><ul><ul><li>There are attractions between the particles in an ideal gas. Because of these attractions, a gas can condense, or even solidify, when it is compressed or cooled. </li></ul></ul></ul>
    9. 10. <ul><ul><li>Real gases differ most from ideal gases at low temperatures and high pressures. </li></ul></ul><ul><ul><li>Slow moving, crowded particles will be more affected by their intermolecular forces and volume. </li></ul></ul>
    10. 11. 14.3 Section Quiz. <ul><ul><li>1. An aerosol spray can with a volume of 325 mL contains 3.00 g of propane (C 3 H 8 ) as a propellant. What is the pressure in atm of the gas in the can at 28°C? </li></ul></ul><ul><ul><ul><li>524 kPa </li></ul></ul></ul><ul><ul><ul><li>2.31 10 4 kPa </li></ul></ul></ul><ul><ul><ul><li>475 kPa </li></ul></ul></ul><ul><ul><ul><li>0.524 kPa </li></ul></ul></ul>
    11. 12. 14.3 Section Quiz. <ul><ul><li>2. Find the volume of a gas in liters if 2.95 mol has a pressure of 77.0 kPa at a temperature of 52°C. </li></ul></ul><ul><ul><ul><li>22.4 L </li></ul></ul></ul><ul><ul><ul><li>16.6 L </li></ul></ul></ul><ul><ul><ul><li>103 L </li></ul></ul></ul><ul><ul><ul><li>50.2 L </li></ul></ul></ul>
    12. 13. 14.3 Section Quiz. <ul><ul><li>3. An ideal gas differs from a real gas in that the molecules of an ideal gas </li></ul></ul><ul><ul><ul><li>have no attraction for one another. </li></ul></ul></ul><ul><ul><ul><li>have a significant volume. </li></ul></ul></ul><ul><ul><ul><li>have a molar mass of zero. </li></ul></ul></ul><ul><ul><ul><li>have no kinetic energy. </li></ul></ul></ul>

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