mhchem

[Wolfgang Engelmann]

What do I miss?

A more convenient way to typeset chemical formulas is to use the command 
\ce that is available when the LATEX-package mhchem is installed. After 
inserting \ce to a formula a new blue box appears where chemical 
formulas can be inserted in an intuitive way.

I inserted \usepackage{mhchem} in the preamble!

\ceCO2

\ce CO2

\ce CO2

no blue box appears

I found >

\usepackage[version=3]{mhchem}

But still no correct output

Wolfgang
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