The mass % natural abundance of the isotopes 1H and 2H (D) are 99.985 and 0.015 respectively. The mass % natural abundance of the isotopes 16O, 17O and 18O are 99.759, 0.037 and 0.204 respectively. In a mass spectrometry experiment on naturally occurring water, at what m/z values would you expect to observe the three most abundant peaks for the molecular ions and what would you expect to be their relative abundances?

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.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

How many grams of phosphorus are contained in 5.09 moles of phosphorus?