gas laws

  • pv = k

  • v/t = k

  • p/t = k

  • combined gas law: pv/t=k

  • if you change conditions, the constant must still be the same

  • p2v2/t2 is STILL = k and = pv/t

  • you cannot predict relationships by changing multiple variables

  • BOYLE’S LAW:

    • volume and pressure is inversely proportional

    • temperature is constant

  • GAY LUSSAC’s LAW

    • pressure and temperature is directly proportional

    • volume is constant

  • CHARLES’S LAW

    • volume and temperature is directly proportional

    • pressure is constant

  • COMBINED LAW

    • pv/t=p2v2/t2

  • IDEAL GAS LAW

    • gas law constant - R

    • pv/nt=R

    • rewrote into

    • pv=nrt

  • AVOGADRO’S GAS LAW

    • v is directly proportional to n

    • if you add avogadro’s gas law to combined gas law,

    • pv/nt=k

      • this is the IDEAL gas law

  • CONVERSION FACTORS

    • 1 ATM = 760 mmHg = 101.3 kPa = 14.7 psi = 760 Torr

    • atm = atmospheric pressure at sea level

    • mmhg = millimeters mercury

    • kpa = kilo pascals

    • psi = pounds per square inch

    • torr = named after someone named torr.

  • PRESSURE AND TEMPERATURE UNITS

    • temp is a measure of KE.

    • it MUST be in kelvin, not celsius

    • kelvin = C + 273

  • STP

    • standard temperature and pressure

    • 1 atm, 0 celsius