LaTeX Forum

\documentclass[paper=a4,
               ngerman]
               {scrreprt}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{booktabs}
\usepackage{geometry}
\usepackage{microtype}
\usepackage{siunitx}

\geometry{
  left=2.2cm,
  right=1.8cm,
  top=3cm,
  bottom=3cm}

\DeclareSIUnit[number-unit-product = \,]\eq{eq.}

\begin{document}
\begin{table}[ht]
    \caption{Ansatzgrößen}
     \begin{tabular}{p{4cm}p{2.3cm}p{1.2cm}p{2cm}p{2cm}p{1cm}p{1.4cm}}
    \toprule
        Substanz &%
        Molare Masse \si{\gram\per\mole} &%
        Dichte \si{\gram\per\cubic\centi\metre} &%
        Stoffmenge \si{\mole} &%
        Äquivalente \si{\eq} &%
        Masse \si{\gram} &%
        Volumen \si{\milli\liter}  \\
        \midrule
        A"-di"-pin"-säu"-re"-ethyl"-ester"-mono"-chlorid & 192.64 & - & 0.189 & 1 & 36.43 & -\\
        \bottomrule
    \end{tabular}
\end{table}
\end{document}

\documentclass[ngerman, captions=tableheading]{scrreprt}% <- geändert
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{babel}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{geometry}
\usepackage{microtype}
\usepackage{siunitx}
\usepackage{showframe}

\geometry{
  left=2.2cm,
  right=1.8cm,
  top=3cm,
  bottom=3cm
}

\sisetup{locale=DE}

\DeclareSIUnit[number-unit-product = \,]\eq{eq.}

\begin{document}
\begin{table}[ht]
	\caption{Ansatzgrößen}
	\begin{tabularx}{\textwidth}{X *6S}
	\toprule
	Substanz & 
	{Molare Masse} &
	{Dichte} &
	{Stoffmenge} &
	{Äquivalente} &
	{Masse} &
	{Volumen} \\
	& \si{\g\per\mole} & 
	\si{\g\per\cubic\cm} & 
	\si{\mole} & 
	\si{\eq} & 
	\si{\g} & 
	\si{\mL}\\
	\midrule
	Adipinsäureethylestermo"-nochlorid & 192.64 & {--} & 0.189 & 1 & 36.43 & {--}\\
	\bottomrule
	\end{tabularx}
\end{table}
\end{document}