Apparently, though unproven, at 00:46 on Monday 09 May 2011, Peter Humphrey did opine thusly:
> On Sunday 08 May 2011 23:02:16 Alan McKinnon wrote: > > Apparently, though unproven, at 00:14 on Monday 09 May 2011, john did > > opine > > > > thusly: > > > Great widgets. Not sure what a Molar Mass Calculator does? Perhaps > > > weighs your teeth?? > > : > > :-) > > > > "Molar" as in the adjective describing "mole" as in "quantity of matter" > > as in "some gigantic number of identical atoms (or maybe it's > > molecules)". It's a very useful measure of "some quantity of stuff". > > > > IIRC the gigantic number is Avogadro's number, on the order of 10^124. So > > one mole of hydrogen would be the amount of hydrogen containing that > > number of hydrogen atoms (or maybe it's molecules. Whatever.) > > Here's a quotation from http://en.wikipedia.org/wiki/Mole_%28unit%29: > > "The mole is defined as the amount of substance that contains as many > elementary entities (e.g., atoms, molecules, ions, electrons) as there are > atoms in 12 g of the isotope carbon-12 (12C).[1] Thus, by definition, one > mole of pure 12C has a mass of exactly 12 g." (I don't know how those > super- and subscript numbers will appear in e-mail.) > > You just knew you were setting yourself up, didn't you? :) It's near midnight on a Sunday and I'm knackered after a weekend of being father to 2 nine-year old girls - I hadn't even begun thinking it that far through :-) I just knew I was being uber-lazy and expected someone else to do the heavy lifting of looking up the reference. You just knew I was I was being a lazy old fart, didn't you? -- alan dot mckinnon at gmail dot com
