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On Mathematica 13 or later version, the ChemicalFormula and ChemicalReaction functions helpe a lot to deal with chemical formula in Mathematica, but there are still a lot limits as compared to the Chemmacros of LaTeX.

For example, if there is need to make plot label to as it is in LaTeX:

$$\ch{H2O}=\ch{H2}+\ch{O2}$$

How should I do? I tried to do this in Mathematica:

Plot[Sin[x], {x, 1, 5}, 
 PlotLabel -> 
  ChemicalFormula["H2O"]["Formula"] <> "=" <> 
   ChemicalFormula["H2"]["Formula"] <> "+" <> 
   ChemicalFormula["O2"]["Formula"]]

But the output is

enter image description here

Deleting the <> will cause this wrong output:

enter image description here

Of course, they are all wrong.

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  • $\begingroup$ Could you show full latex code which makes your latex works? Using \usepackage{chemmacros} it gives errors. So I used mhchem $\endgroup$
    – Nasser
    Jun 3 at 3:11
  • $\begingroup$ @Nasser Thanks for your reply. \ce should be \ch, and I changed them now. $\endgroup$
    – Y. zeng
    Jun 3 at 3:21

1 Answer 1

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Either do

lbl = Style[
   Row[{ChemicalFormula["H2O"]["Formula"], " = ", 
     ChemicalFormula["H2"]["Formula"], " + ", 
     ChemicalFormula["O2"]["Formula"]}], 20];

Plot[Sin[x], {x, 1, 5}, PlotLabel -> lbl]

Mathematica graphics

Or better

Needs["MaTeX`"]

SetOptions[MaTeX,"Preamble"->{"\\usepackage{mhchem,upgreek}"}];
lbl=MaTeX["\ce{H2O}=\ce{H2}+\ce{O2}",Magnification->2];
Plot[Sin[x],{x,1,5},PlotLabel->lbl]

Mathematica graphics

Update

For ch instead of ce then do

Needs["MaTeX`"]
SetOptions[MaTeX, "Preamble" -> {"\\usepackage{chemmacros}"}];
lbl = MaTeX["\\ch{H2O}=\\ch{H2}+\\ch{O2}", Magnification -> 2];
Plot[Sin[x], {x, 1, 5}, PlotLabel -> lbl]

Mathematica graphics

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  • $\begingroup$ As your second way, when I ran it, there is Cannot open MaTeX ` What is the MaTeX and how do you know you can run it in Mathematica? Thanks $\endgroup$
    – Y. zeng
    Jun 3 at 3:18
  • $\begingroup$ @Y.zeng Matex is a package. You need to install it first. see MaTeXInstall it assumes you have a TeX also installed on your system. See instructions for MaTeX what it needs. $\endgroup$
    – Nasser
    Jun 3 at 3:20
  • $\begingroup$ Thanks. I can run the second code now. It is really good. $\endgroup$
    – Y. zeng
    Jun 3 at 5:34
  • $\begingroup$ The output from MaTeX is a graphic. So the first way may be better as they are characters which can be copied if exported as a format of PDF. $\endgroup$
    – Y. zeng
    Jun 3 at 6:55

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