Am 29.10.2015 um 17:15 schrieb Guenter Milde:
documents that use the mhchem package (which is automatically loaded if
required, by default) fail to compile with XeTeX or LuaTeX and TeX fonts.
I think you discovered a bug in LyX:
We automatically load inputenc:
\usepackage[latin9]{inputenc}
But inputenc must not be used for XeTeX.
So this file becomes uncompilable when uncommenting the inputenc line:
\documentclass[english]{article}
\usepackage[T1]{fontenc}
%\usepackage[latin9]{inputenc}
\PassOptionsToPackage{version=3}{mhchem}
\usepackage{mhchem}
\usepackage{babel}
\begin{document}
test: $\ce{H2SO4}$
\end{document}
I get then this error message:
! Package inputenc Error: inputenc is not designed for xetex or luatex.
(inputenc) only UTF-8 supported.
See the inputenc package documentation for explanation.
Type H <return> for immediate help.
mhchem is not to blame here.
regards Uwe
