Calculate the molecular formula of a compound with empirical formula \(\mathrm{CH}_{2} \mathrm{O}\) and relative molecular mass 120
\((\mathrm{C}=12, \mathrm{O}=16, \mathrm{H}=1)\)

A. \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\)
B. \(\mathrm{C}_{1} \mathrm{H}_{3} \mathrm{O}_{4}\)
C. \(\mathrm{C}_{3} \mathrm{H}_{16} \mathrm{O}_{\text {a }}\)
D. \(\mathrm{C}_{3} \mathrm{H}_{2} \mathrm{O}_{3}\)  

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Correct Answer: D