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**1. The Question: The pufferfish is an Asian delicacy, but also contains a deadly toxin, tetrodotoxin. The LD50 (lethal dose to kill 50% of the population) is 10 micrograms/kg. An analysis of 18.34 mg of tetrodoxin produced 27.82 mg of carbon dioxide, 13.2 mg of nitrogen dioxide, and 8.83 mg water in a combustion reaction.**

**a) Determine the empirical formula for tetrodotoxin. b) What mass of tetrodotoxin is the LD50 for a 70kg person?**

**2. The answer is C**

_{11}H_{17}N_{3}O_{8}, but I'm not getting it.**After converting to mass, and then back to moles, then dividing by the smallest # of moles, and then multiplying by the factor ("common denominator") that gives all integer values...I'm not getting what I'm supposed to be getting. I've also checked 5 times to make sure I'm not punching something wrong in the calculator.**

**3. I'm not going to type out the WHOLE thing of how I arrived to my answer, cause it took about one page of writing to arrive at the answer. But I'm not getting C**

_{11}H_{17}N_{3}O_{8}for the empirical formula, I keep getting C_{11}H_{17}N_{5}O_{6}which is WRONG. Not sure what I'm doing wrong, but if someone could help me, that would be great. Thanks! (I've attempted this question 5-6 times already, and keep getting the same WRONG answer.)