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What is the empirical formula for nitroglycerin?
The molecular formula for nitroglycerin is ##"C"_3"H"_5"N"_3"O"_9##. https://en.wikipedia.org/wiki/Nitroglycerin This is also the empirical formula.
The empirical formula represents the lowest whole number ratio of in a compound. In the case of nitroglycerin, its formula ##"C"_3"H"_5"N"_3"O"_9## cannot be reduced further and keep the ratios whole numbers. Therefore, its molecular formula is the same as its empirical formula.