熱化学

\documentclass[b5j,10pt,twoside]{tetsujsarticle}
\usepackage{tetsuchem}
\pagestyle{fancy}

\begin{document}
\begin{tikzpicture}[>=stealth]
\draw[->] (0,0) -- (0,5);
\draw (0.5,0.5) -- (10,0.5) node[above,midway] {\makebox[16zw][l]{\ce{CO2 \liq + 2H2O \liq}}};
\draw (6.5,2.5) -- (10,2.5) node[above,midway] {\ce{CO2 \gas + 2H2O \gas}};
\draw (0.5,4.5) -- (10,4.5) node[above,midway] {\ce{C \gas + 4H \gas + 4O \gas}};
\draw (0.5,1.5) -- (5.5,1.5) node[above,midway] {\ce{CH4 \gas + 2O2 \gas}};
\draw (0.5,3) -- (5.5,3) node[above,midway] {\ce{C \gra + 2H2 \gas + 2O2 \gas}};
\draw[<->,line width=1pt] (7,0.5) -- (7,2.5) node[right,midway] {$44\times2\,\kJ$};
\draw[<->,line width=1pt] (7,3) -- (7,4.5) node[right,midway] {$804\times2+463\times4\,\kJ$};
\draw[<->,line width=1pt] (1,0.5) -- (1,1.5) node[right,midway] {$890\,\kJ$};
\draw[<->,line width=1pt] (1,2) -- (1,3) node[right,midway] {$Q\,\kJ$};
\draw[<->,line width=1pt] (1,3.5) -- (1,4.5) node[right,midway] {$750+432\times2+494\times2\,\kJ$};
\end{tikzpicture}

\br2

\begin{tikzpicture}[>=stealth]
\draw[->] (0.2,0) -- (0.2,2.5);
\draw (0.5,0.5) -- (3.5,0.5) node[above,midway] {\makebox[7zw][l]{\ce{H2O\liq}}};
\draw (0.5,1.75) -- (3.5,1.75) node[above,midway] {\ce{H2O\gas}};
\draw[<->,line width=1pt] (2.5,0.5) -- (2.5,1.75) node[right,midway] {$44\,\kJ$};
\node[anchor=south west] at (3.75,0.5) {\gt{液体}};
\node[anchor=south west] at (3.75,1.75) {\gt{気体}};
\end{tikzpicture}

\end{document}