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Zarko
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Addendum:
With defining \SetTblrInner you can make above MWE a wee bit shorter😊:

\documentclass{article} % or some other suitable document class
\usepackage{iftex} \ifpdftex\usepackage[T1]{fontenc}\fi
\usepackage{tabularray}
\UseTblrLibrary{booktabs}
\usepackage{upgreek,mhchem}

\hyphenation{iso-prene di-terpene tri-terpene mono-terpene 
             sesqui-terpene}

\begin{document}
    \begin{table}[ht]
\SetTblrInner{width=0.48\linewidth,
             baseline = t,
             colspec = {@{} Xll @{}},
             row{2-Z} = {rowsep = 0.5pt},
             row{every[4]{5}{-1}} = {belowsep=1.5ex},
             }
\caption{List of compounds in mixed stock solution. }

\smallskip
\textbf{Legend:}
iso: isoprene, mt: monoterpene, omt: oxygenated monoterpene, sqt: sesquiterpene, osqt: oxygenated sesquiterpene, dt: diterpene, tt: triterpene.

\smallskip
\begin{tblr}{}
    \toprule
% body of table 1     
\end{tblr}\hspace{\fill}\begin{tblr}{}
    \toprule
    \bottomrule
% body of table 2     
\end{tblr}
    \end{table}
\end{document} 

which gives almost the same result as above MWE (difference is in differently defined rowsep for the first tables rows and for body tables rows):

enter image description here

Addendum:
With defining \SetTblrInner you can make above MWE a wee bit shorter😊:

\documentclass{article} % or some other suitable document class
\usepackage{iftex} \ifpdftex\usepackage[T1]{fontenc}\fi
\usepackage{tabularray}
\UseTblrLibrary{booktabs}
\usepackage{upgreek,mhchem}

\hyphenation{iso-prene di-terpene tri-terpene mono-terpene 
             sesqui-terpene}

\begin{document}
    \begin{table}[ht]
\SetTblrInner{width=0.48\linewidth,
             baseline = t,
             colspec = {@{} Xll @{}},
             row{2-Z} = {rowsep = 0.5pt},
             row{every[4]{5}{-1}} = {belowsep=1.5ex},
             }
\caption{List of compounds in mixed stock solution. }

\smallskip
\textbf{Legend:}
iso: isoprene, mt: monoterpene, omt: oxygenated monoterpene, sqt: sesquiterpene, osqt: oxygenated sesquiterpene, dt: diterpene, tt: triterpene.

\smallskip
\begin{tblr}{}
    \toprule
% body of table 1     
\end{tblr}\hspace{\fill}\begin{tblr}{}
    \toprule
    \bottomrule
% body of table 2     
\end{tblr}
    \end{table}
\end{document} 

which gives almost the same result as above MWE (difference is in differently defined rowsep for the first tables rows and for body tables rows):

enter image description here

Source Link
Zarko
  • 312.9k
  • 24
  • 189
  • 395

With use of the tabularray package with option row{every[4]{5}{-1}} for inserting small vertical space after each four rows in table body (as supplement to nice @Mico answer (+1), for exercise):

\documentclass{article} % or some other suitable document class
\usepackage{iftex} \ifpdftex\usepackage[T1]{fontenc}\fi
\usepackage{tabularray}
\UseTblrLibrary{booktabs}
\usepackage{upgreek,mhchem}

\hyphenation{iso-prene di-terpene tri-terpene mono-terpene 
             sesqui-terpene}

\begin{document}
    \begin{table}[ht]
\caption{List of compounds in mixed stock solution. }

\smallskip
\textbf{Legend:}
iso: isoprene, mt: monoterpene, omt: oxygenated monoterpene, sqt: sesquiterpene, osqt: oxygenated sesquiterpene, dt: diterpene, tt: triterpene.

\smallskip
\begin{tblr}{width=0.48\textwidth,
             baseline = t,
             colspec = {@{} Xll @{}},
             rowsep = 1pt,
             row{every[4]{5}{-1}} = {belowsep=1.5ex},
            }
    \toprule
Compound & Type & Formula \\
    \midrule
Isoprene & iso & \ce{C5H8} \\  
$\upalpha$-Pinene & mt & \ce{C10H16} \\    
Camphene & mt & \ce{C10H16} \\   
Sabinene & mt & \ce{C10H16} \\  
 
$\upbeta$-Pinene & mt & \ce{C10H16} \\ 
$\upbeta$-Myrcene & mt & \ce{C10H16} \\   
$\upalpha$-Phellandrene & mt & \ce{C10H16} \\   
3-Carene & mt & \ce{C10H16} \\   

$\upalpha$-Terpinene & mt & \ce{C10H16} \\   
\textit{m}-Cymene & mt & \ce{C10H14} \\ 
\textit{p}-Cymene & mt & \ce{C10H14} \\  
Ocimene & mt & \ce{C10H16} \\ 

Eucalyptol & omt & \ce{C10H18O} \\ 
\textit{D}-Limonene & mt & \ce{C10H16} \\   
\textit{o}-Cymene & mt & \ce{C10H14} \\ 
$\upgamma$-Terpinene & mt & \ce{C10H16} \\  

Sabinene Hydrate & omt & \ce{C10H18O} \\ 
Terpinolene & mt & \ce{C10H16} \\
Linalool & omt & \ce{C10H18O} \\    
Fenchol & omt & \ce{C10H18O} \\ 

Isopulegol & omt & \ce{C10H18O} \\
                \\ % blank line
    \bottomrule
\end{tblr}\hspace{\fill} % maximize horizontal separation
\begin{tblr}{width=0.48\textwidth,
             baseline = t,
             colspec = {@{} Xll @{}},
             rowsep = 1pt,
             row{every[4]{5}{-1}} = {belowsep=1.5ex},
            }
    \toprule
    Compound & Type & Formula \\
    \midrule
Isoborneol & omt & \ce{C10H18O} \\    
($-$)-Borneol & omt & \ce{C10H18O} \\    
($+$)-Borneol & omt & \ce{C10H18O} \\   
Menthol & omt & \ce{C10H20O} \\   

Terpinen-4-ol & omt & \ce{C10H18O} \\
$\upalpha$-Terpineol & omt & \ce{C10H18O} \\  
Citronellol & omt & \ce{C10H20O} \\   
Carvacrol & omt & \ce{C10H14O} \\   

Geraniol & omt & \ce{C10H18O} \\   
Thymol & omt & \ce{C10H14O} \\ 
($-$)-$\upalpha$-Cedrene & sqt & \ce{C15H24} \\  
Caryophyllene & sqt & \ce{C15H24} \\  

trans-$\upbeta$-Farnesene & sqt & \ce{C15H24} \\  
Humulene & sqt & \ce{C15H24} \\  
Valencene & sqt & \ce{C15H24} \\ 
Nerolidol & osqt & \ce{C15H26O} \\ 

Guaiol & osqt & \ce{C15H26O} \\ 
Cedrol & osqt & \ce{C15H26O} \\  
($-$)-$\upalpha$-Bisabolol & osqt & \ce{C15H26O} \\  
Farnesol & osqt & \ce{C15H26O} \\ 

Phytane & dt & \ce{C20H42} \\ 
Squalene & tt & \ce{C30H50}  \\
    \bottomrule
\end{tblr}
    \end{table}
\end{document} 

enter image description here