Lab 8_ Apparent Molecular Weight of Air.pptx - Lab 8 u2013...

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Lab 8 – Apparent Molecular Weight of Air
Gas Laws and Their foundations Four variable can describe gases - pressure (P) – measurements in mmHg/torr ; calculations in atm - temperature (T) – measurements in o C ; calculations in kelvin - volume (V) – measurements in mL ; calculations in L - amount (n) – measurements in g ; calculations in moles * are interdependent Gas laws: express the effect of one variable on another while hold the other two constant Describe the behavior of ideal gases - gases that have a linear relationship among n, V, P , & T - no ideal gas exists - N 2 , O 2 , H 2 , and noble gases nearly ideal at ordinary T & P
Gas Pressure Force of the collisions of gas molecules with the walls of container Pressure = force/area Measuring Gas Pressure - barometer : measures atmospheric pressure - manometer: measures pressure of a gas in an experiment Units of Pressure - derived unit, SI unit is Pascal(Pa) = 1N/m 2 - standard atmosphere( atm) : avg. atmospheric pressure measured at sea level at 0⁰C. 1 atm = 101.325 kPa = 101,325 Pa -

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