Units of Amount of Substance - Mole, Faraday Constant, Langmuir, Equivalent, Osmole, Standard Cubic Foot, Einstein, Pound Mole, Ounce Mole (Paperback)

Chapters: Mole, Faraday Constant, Langmuir, Equivalent, Osmole, Standard Cubic Foot, Einstein, Pound Mole, Ounce Mole. Source: Wikipedia. Pages: 41. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: The mole (symbol mol) is the SI base unit of amount of substance, one of a few units used to measure this physical quantity. The name "mole" is an 1897 translation of the German Mol, coined by Wilhelm Ostwald in 1893, although the related concept of equivalent mass had been in use at least a century earlier. The name is assumed to be derived from the German word Molekul (molecule). The mole is commonly used in medicine to measure small amounts of a substance in blood or other liquids. In this context, millimoles per litre (mmol/L), micromoles/litre (umol/L), or nanomoles/L (nmol/L) are often used. The mole is defined as the amount of substance of a system that contains as many "elementary entities" (e.g. atoms, molecules, ions, electrons) as there are atoms in 12 g of carbon-12 (C). A mole has 41510 atoms or molecules of the pure substance being measured. A mole of a substance has mass in grams exactly equal to the substance's molecular or atomic weight. That is to say, a substance's atomic or molecular mass in atomic mass units is the same as its molar mass in grams. Because of this, one can measure the number of moles in a pure substance by weighing it and comparing the result to its molecular or atomic weight. The current definition of the mole was approved during the 1960s: Prior to that, there had been definitions based on the atomic weight of hydrogen (about one gram of hydrogen-1 gas, excluding its heavy isotopes), the atomic weight of oxygen, and the relative atomic mass of oxygen-16: the four different definitions were equivalent to within 1%. The most common method of measuring an amount...More: http: //booksllc.net/?id=3740