# mhchem

The mhchem extensions implements the `\ce` and `\pu` chemical equation macros of the LaTeX mhchem package. See the mhchem home page for more information and documentation for mhchem.

For example

    \ce{C6H5-CHO}
    \ce{$A$ ->[\ce{+H2O}] $B$}
    \ce{SO4^2- + Ba^2+ -> BaSO4 v}

This extension is loaded automatically when the autoload extension is used. To load the mhchem extension explicitly, add `'[tex]/mhchem'` to the `load` array of the `loader` block of your MathJax configuration, and add `'mhchem'` to the `packages` array of the `tex` block.

    window.MathJax = {
      loader: {load: ['[tex]/mhchem']},
      tex: {packages: {'[+]': ['mhchem']}}
    };

Alternatively, use `\require{mhchem}` in a TeX expression to load it dynamically from within the math on the page, if the require extension is loaded.

Note

The implementation of the mhchem extension was completely rewritten for MathJax by the author of the original LaTeX package. The older version was still available MathJax version 2.7, but it is no longer part of MathJax version 3. Only the newer version of mhchem is available.

## mhchem Commands

The mhchem extension implements the following macros: `\ce`, `\longleftrightarrows`, `\longLeftrightharpoons`, `\longrightleftharpoons`, `\longRightleftharpoons`, `\pu`, `\tripledash`, `\xleftarrow`, `\xleftrightarrow`, `\xLeftrightharpoons`, `\xrightarrow`, `\xrightleftharpoons`, `\xRightleftharpoons`