4a - Partial Pressure

4a - Partial Pressure - Partial Pressure When moles are not...

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Unformatted text preview: Partial Pressure When moles are not moles and atmospheres are not atmospheres Chemists are Pragmatists Most gas phase reactions occur in sealed flasks youve got to keep the reactants from escaping! That means that, typically, the volume is fixed and the temperature is known (unless it is a very exothermic or endothermic reaction and the temperature isnt controlled). The Gas Law revisited PV = nRT In a sealed flask, V is constant and (usually) so is Temperature. Collect the constants! P = n (RT ) = n * constant V The pressure is directly proportional to n, the number of moles! Suddenly bizarre units This is critically important for a reaction because, as you know, reactions are all about MOLES! MOLES! MOLES! For gas phase reactions, the pressure is sometimes a substitute for the number of moles. YOU CAN ACTUALLY MEASURE THE AMOUNT OF SOMETHING IN ATMOSPHERES!!!!!! PV=nRT does not discriminate While it may not be immediately obvious, theres another interesting thing about PV=nRT None of the variables directly depends on the identity of the gas molecules!...
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4a - Partial Pressure - Partial Pressure When moles are not...

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