Lecture2-7-14CHEM.pdf

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Department
Chemistry
Course
CHE 2A
Professor
A N D R E A S T O U P A D A K I S
Semester
Winter

Description
The  Ideal  Gas  Law PV=nRT expresses  relationship  between  V,  P,  T,  and  amount  of  moles derived  experimentally,  works  when  gas  behaves  ideal  yet  there  are  no  really  ideal  gases R=  proportionality  constant STP  273K  and  1  atm Now  it  is  273K  and  1  bar V  at  STP  =22.7L/mol Mass  from  Reactant  Volume volR-­(PV=nRT)-­>mol  R  -­(mol  ratio)-­>  mol  P  -­(M.M.)  -­>  g  P n=m/M.M.  (g/g/mol) PV=(m/M.M)RT M.M=mRT/PV=(m/v)  (RT/P)=  dRT/P d=P(M.M.)/RT The  General  Gas  Equation used  for  gases  at  two  diff.  sets  of  conditions could  be  a  mixture Initial:  R=PiVi/niTi=Final:R=PfVf/nfTf Law  of  Combining  Volumes: aA(g)+bB(g)=cC(g) -­you  need  two  or  more  gases Va/Vb=a/b  (same  T/P)and  Vb/Vc=b/
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