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• To: mathgroup at smc.vnet.net
• Subject: [mg100175] new to group
• From: Jem <not.a.ninja25 at gmail.com>
• Date: Wed, 27 May 2009 04:07:01 -0400 (EDT)

```Hi,

Hi, I am a postgrad student and completely new to mathematica, I am just
starting to realise the possibilities.

I am trying to do a chemical speciation calculation.
I have a set of simultaneous equations which represents the equilibria, mass
balance, and charge balance in the system.

I want to eliminate some of the variables, and then be able to solve for the
remaining ones.
My system of equations looks like this:
a=b+c+d
e=f+g+c+2d
h=c/(bg)
i=d/(cg)
hi=d/(bg^2)
j=mg/f
k=lm
n+m+b+c=g+l

I will try to attach an image of what my formula looks like sofar.
Basically, I can solve for the variable I want, but I am having trouble
eliminating the ones I don't want (ie. I am getting an answer that is in
terms of the wrong variables)

I have been in the help files for ages, and don't really understand how to
do this.
I would really appreciate some pointers!!
Thanks

Solve[{a == b + c + d, e == f + g + c + 2 d, h == c/(b*g),
i == d/(c*g), h*i == d/(b*g^2), j == m*g/f, k == l*m,
n + m + b + c == g + l}, {g}]

```

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