Tetrodotoxin is a toxic chemical foudn in fugu pufferfish, a popular but rare delicacy in Japan. This compound?

La LEe

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Tetrodotoxin is a toxic chemical foudn in fugu pufferfish, a popular but rare delicacy in Japan. This compound has a LD50 (the amound of substance that is lethal to 50% of a population sample) of 10ug per kg of body mass. tetrodotoxin is a 41.38% carbon by mass, 13.6% nitrogen by mass, and 5.37% hydrogen by mass with the remaining amount consisting of oxygen. What is the empirical formula of tetrodotoxin? if three molecules o tetrodotoxin hve a mass of 1.59*10^21g, what is the molecular formula of tetrodotoxin? what number of molecules of tetrodotoxin would be the LD50 dosage for a person weighing 165lb?

Please I need help! This is my little brother's homework but I took chemistry courses in college long time ago and I forgot how to do this particular problem.... Thank you guys
 
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