a magnesium halide salt has the formula MgX2. A 0.593g sample of MgX2 was dissolved in 100mL of deionized water, followed by the addition of excess NaOH. The precipitate of Mg (OH)2 was filtered, washed, and dried. The precipitate was found to have a mass of 0.187g. what is the percent by mass of Mg in the original unknown compound ?

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.