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Re: .split() Qeustion

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Le dimanche 18 août 2013 01:30:14 UTC+2, Gregory Ewing a écrit :
> wxjmfauth@gmail.com wrote:
> 
> > Na  + Cl   -->   NaCl
> 
> > 
> 
> > the chemist combines *one mole* of sodium and *one
> 
> > mole* of chlorine to get *one mole* of sodium chloride
> 
> > 
> 
> > It's independent of the number of "particles" in a mole.
> 
> 
> 
> The actual number chosen for the unit is arbitrary, but
> 
> number of particles is still the central issue. The
> 
> important thing is to have the *same* number of particles
> 
> of Na and Cl.
> 
> 
> 
> Weight only comes into it because it's totally impractical
> 
> to count particles. And the particular number 6.02e23 is
> 
> chosen because it happens to give a convenient relationship
> 
> between number of particles and grams. If chemists had
> 
> decided to use ounces instead, the number would be different.
> 
> 
> 
> -- 
> 
> Greg

--------


"The actual number chosen for the unit is arbitrary, but
number of particles is still the central issue."

No.


"The important thing is to have the *same* number of particles
of Na and Cl."

Yes.
And it is precisely for that reason, a chemist works in "mole
arithetic".

Same reaction as above

Na  + Cl   -->   NaCl

in pseudo math, with n = number of elements in a mole.


n * Na  + n * Cl  --> n * NaCl    <==>
n * (Na + Cl)  -->  n * NaCl      <==> division by n
Na + Cl   -->  NaCl


for any n.

----

The determination of n, the number of elements in
a mole, is an indipendent and separate problem.
(BTW, a very complicate task).


jmf

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.split() Qeustion eschneider92@comcast.net - 2013-08-13 21:51 -0700
  Re: .split() Qeustion Gary Herron <gary.herron@islandtraining.com> - 2013-08-13 22:12 -0700
    Re: .split() Qeustion Alister <alister.ware@ntlworld.com> - 2013-08-14 08:30 +0000
      Re: .split() Qeustion Joshua Landau <joshua@landau.ws> - 2013-08-14 11:31 +0100
        Re: .split() Qeustion Alister <alister.ware@ntlworld.com> - 2013-08-14 13:29 +0000
        Re: .split() Qeustion Duncan Booth <duncan.booth@invalid.invalid> - 2013-08-15 09:15 +0000
          Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-15 02:46 -0700
            Re: .split() Qeustion Chris Angelico <rosuav@gmail.com> - 2013-08-15 10:54 +0100
            Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-15 11:22 +0000
              Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-15 06:58 -0700
      Re: .split() Qeustion Peter Otten <__peter__@web.de> - 2013-08-14 13:45 +0200
      Re: .split() Qeustion Joshua Landau <joshua@landau.ws> - 2013-08-14 12:55 +0100
        Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-14 07:32 -0700
          Re: .split() Qeustion random832@fastmail.us - 2013-08-14 13:05 -0400
            Re: .split() Qeustion Steven D'Aprano <steve@pearwood.info> - 2013-08-15 07:17 +0000
          Re: .split() Qeustion Chris Angelico <rosuav@gmail.com> - 2013-08-14 18:14 +0100
            Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-15 00:46 -0700
              Re: .split() Qeustion Lele Gaifax <lele@metapensiero.it> - 2013-08-15 16:38 +0200
              Re: .split() Qeustion MRAB <python@mrabarnett.plus.com> - 2013-08-15 15:54 +0100
              Re: .split() Qeustion Lele Gaifax <lele@metapensiero.it> - 2013-08-15 17:30 +0200
              Re: .split() Qeustion Chris Angelico <rosuav@gmail.com> - 2013-08-15 16:43 +0100
                Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-16 04:13 +0000
                Re: .split() Qeustion Roy Smith <roy@panix.com> - 2013-08-16 00:29 -0400
                Re: .split() Qeustion Dave Angel <davea@davea.name> - 2013-08-16 05:27 +0000
                Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-17 02:38 +0000
                Re: .split() Qeustion Chris Angelico <rosuav@gmail.com> - 2013-08-17 03:45 +0100
                Re: .split() Qeustion Gene Heskett <gheskett@wdtv.com> - 2013-08-16 10:30 -0400
                Re: .split() Qeustion Gene Heskett <gheskett@wdtv.com> - 2013-08-16 10:24 -0400
                Re: .split() Qeustion Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-08-17 11:16 +1200
                Re: .split() Qeustion Ben Finney <ben+python@benfinney.id.au> - 2013-08-16 15:59 +1000
                Re: .split() Qeustion Roy Smith <roy@panix.com> - 2013-08-16 07:14 -0400
                Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-16 06:14 -0700
                Re: .split() Qeustion Roy Smith <roy@panix.com> - 2013-08-16 09:23 -0400
                Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-17 01:09 -0700
                Re: .split() Qeustion Roy Smith <roy@panix.com> - 2013-08-17 07:55 -0400
                Re: .split() Qeustion Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-08-18 11:30 +1200
                Re: .split() Qeustion wxjmfauth@gmail.com - 2013-08-18 00:17 -0700
                Re: .split() Qeustion Grant Edwards <invalid@invalid.invalid> - 2013-08-16 13:59 +0000
              Re: .split() Qeustion Joshua Landau <joshua@landau.ws> - 2013-08-15 17:54 +0100
              Re: .split() Qeustion Chris Angelico <rosuav@gmail.com> - 2013-08-15 19:28 +0100
                Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-16 04:17 +0000
              Re: .split() Qeustion Joshua Landau <joshua@landau.ws> - 2013-08-15 19:40 +0100
              Re: .split() Qeustion Terry Reedy <tjreedy@udel.edu> - 2013-08-15 17:40 -0400
                Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-16 04:22 +0000
              Re: .split() Qeustion Dave Angel <davea@davea.name> - 2013-08-15 22:56 +0000
                Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-16 04:39 +0000
                Re: .split() Qeustion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-16 04:41 +0000
          Re: .split() Qeustion Tim Chase <python.list@tim.thechases.com> - 2013-08-14 12:29 -0500
          Re: .split() Qeustion Skip Montanaro <skip@pobox.com> - 2013-08-14 12:38 -0500
          Re: .split() Qeustion Chris Angelico <rosuav@gmail.com> - 2013-08-14 18:46 +0100
          Re: .split() Qeustion Terry Reedy <tjreedy@udel.edu> - 2013-08-14 15:45 -0400
  Re: .split() Qeustion Dave Angel <davea@davea.name> - 2013-08-14 05:35 +0000
  Re: .split() Qeustion eschneider92@comcast.net - 2013-08-13 22:44 -0700
  Re: .split() Qeustion Krishnan Shankar <i.am.songoku@gmail.com> - 2013-08-13 22:37 -0700
  .split() Qeustion "Alfonso Andalon Jr." <alfonsoandalon@gmail.com> - 2013-08-16 21:31 -0700

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