(Solved): Identify the empirical formula for the compound with the mass composition and mass spectrum shown b ...

Identify the empirical formula for the compound with the mass composition and mass spectrum shown below \( 32.9 \% \mathrm{C}, 6.8 \% \mathrm{H}, 38.3 \% \mathrm{~N} \), and \( 21.9 \% \mathrm{O} \) \[ \begin{array}{l} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{~N}_{2} \mathrm{O} \\ \mathrm{C}_{4} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2} \\ \mathrm{C}_{3} \mathrm{H}_{7} \mathrm{~N}_{3} \mathrm{O} \\ \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{NO}_{2} \end{array} \]