LaTeX forum ⇒ Math & Science ⇒ Cross-referencing with mhchem package

[Sonntag]

Hi!

Code: [Select all] [Expand/Collapse] [Download] (untitled.tex)

\reaction{H2 + OH* <=> H2O + H*} 

I want to cross-reference an equation that I've introduced with the reaction-environment from the mhchem package. How can I do it? Hope for your answers.

Sonntag

[Johannes_B]

Hi and welcome,

undefined control sequence reaction. Please give us more information.

Code: [Select all] [Expand/Collapse] [Download] (untitled.tex)

\documentclass{article}
\usepackage[version=3]{mhchem}
\begin{document}
\reaction{H2 + OH* <=> H2O + H*} \label{Water}
 
See reaction~\ref{Water}
\end{document}

[Sonntag]

Here is a short mini-example:

Code: [Select all] [Expand/Collapse] [Download] (untitled.tex)

\documentclass{article}
 
\usepackage { chemexec }
\usepackage[version=4,arrows=pgf-filled]{mhchem}	
 
\begin{document}
\reaction{O2 + H* <=> OH* + O*} 
\end{document}

[Johannes_B]

Hm, interesting. I just poked the author to have a look at this. Clemens is a very active developer, maintining multiple packages like exsheets for exam sheets and chemmacros for a whole bundle of chemistry stuff, more customizable than mhchem.

As it stands now, the package is from 2011, but not declared obsolete. Currently, your code is giving an option clash, that should be fixed within chemexec. I recommend to use the above mentioned and more up-to-date packages.

Code: [Select all] [Expand/Collapse] [Download] (untitled.tex)

\documentclass{article}
\usepackage { chemexec }
\usepackage[version=4,arrows=pgf-filled]{mhchem}
\begin{document}
\reaction{H2 + OH* <=> H2O + H* \label{Water}}
See reaction~\ref{Water}
\end{document}

[Sonntag]

Thanks for your answer!

[Johannes_B]

This might be an interesting read, thanks Clemens for sending me that link.
myChemistry

[cgnieder]

chemexec has been my first attempt of writing a package ever. I knew little to nothing about writing a package and it is an obsolete package. Don't use it but use mhchem or chemmacros or chemformula instead. Using chemexec is at your own risk and I won't provide any support to any conflicts due to its usage.

Best regards

[Sonntag]

Thank your help!

In the other packages I couldn't find a command that numbers my reaction equations independantly from the math mode like chemexec does with the \reaction command. (It numbers reaction equations with "R1", "R2" etc.) There's a possibility to do this with the other packages that I haven't seen yet?

Sonntag

[Johannes_B]

Sure, an up to date version needed.

Code: [Select all] [Expand/Collapse] [Download] (untitled.tex)

\documentclass{article}
\usepackage{chemmacros}
\usepackage{showframe}
\begin{document}
\listofreactions
\begin{reaction}
	H2 + O* <=> OH* + H*
\end{reaction}
\renewtagform{reaction}[R ]{\{}{\}}
\begin{reactions}
	Ca + O &-> CaO \\
	H2 + O* &<=> OH* + H*
\end{reactions}
\end{document}