Pls someone help me with this question pls

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.