\documentclass{article}
\usepackage{siunitx}
\usepackage{luatexja}

\begin{document}
\SI{2.5e-10}{mol.L^{-1}}


\vrule
\begin{tabular}{Ss}
  -.123 & J.mol^{-1} \\
  1.23e-3 & W.h^{2} \\
\end{tabular}%
\vrule

\vrule
\begin{tabular}{Ss}
   \\\hline
   x & \\\hline
   & x \\
\end{tabular}%
\vrule
\end{document}



