Unknown number: \begin{tabular}{|l|l|l|} \hline & Concentration (M) & Absorbance \\ \hline Standard solution & & 0.288A \\ \hline 1:2dilution(showcalculation) & 0.145A \\ \hline 1:5dilution(showcalculation) & & 0.062 \\ \hline Unknown & From graph: & 0.164A \\ \hline \end{tabular} Optional: Slope of line (show calculation) Concentration from slope (show calculation)