After three half lives what fraction of a radioactive sample has decayed

The pressure in a fluid is affected by which characteristics of that fluid

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.

If the standard reduction potential of a half-cell is positive, which redox reaction is spontaneous when paired with a hydrogen electrode? reduction both reduction and oxidation neither reduction nor oxidation oxidation