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0

It is possible to realize, also, your reaction with arrows displayed using \usepackage[version=4]{mhchem}. In fact you have with this MWE: \documentclass[a4paper,12pt]{scrreprt} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage[ngerman]{babel} \usepackage{graphicx} \usepackage{siunitx} \usepackage[version=4]{mhchem} \begin{document} \[\ce{2 ...

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This was due to a missing :e variant of the \__kernel_file_name_quote:n function in the LaTeX3 kernel. The same error is reported here and it was recently fixed in this commit. The updated code is already on CTAN, so if you update the l3kernel package the error should go away.

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The package mhchem loads the package l3regex, internally. This package, when loaded, says that it is better to use the l3expl package instead. A bit of history. Many years ago, some brave souls started to code LaTeX3, "a long-term research project to develop the next version of the LaTeX typesetting system". The core of their work was the package expl3. "...

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