need chemical equation support

I need create chemical equation.

In mathjax, there is an extension package mhchem.js, which let us type chemical equations. For example, type \ce{H2O} to represent molecular composition of water.

I notice mhchem.js DO exist in htdocs/taoQtiItem/views/js/mathjax/extensions/Tex/mhchem.js, but \ce{H2O} DO NOT work, how to enable mhchem.js?


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