Provide a structure for the following compound: UV spectrum: λmax = 272 nm (ε = 39,500); EI mass spectrum: m/z = 129 (molecular ion and base peak); IR: 2200, 970 cm–1; 1H NMR: δ 5.85 (1H, d, J = 17 Hz); δ 7.35 (1H, d, J = 17 Hz); δ 7.4 (5H, apparent s).

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

What are the constituent metals of stainless steel?