On Mon, 27 Jan 2003 10:16:00 -0500 (EST), Henry Spencer <[EMAIL PROTECTED]> wrote:
>On Sun, 26 Jan 2003, Randall Clague wrote: >> A mole of H2 is 2 grams? Chem 101 is a distant memory, but that >> doesn't ring true. Let's see... Wow. H2 is so light that a mole of >> GH2 weighs 1.9 grams at STP. OK. Far out. > >A mole of H2, in any state, weighs 2g. More precisely, 2.01594g (twice >hydrogen's atomic weight of 1.00797). That's odd. 1.9 was only a BOTE, but I was expecting better accuracy than 5%. I used: N atomic weight: 14 O atomic weight: 16 H2 molecular weight: 2 ICAO sea level density of air: 1.225 kg/m^3 liters per mole at STP: 22.4 to get air atomic weight: 14.4 H2 molar weight: 3.8 grams then realized I use atomic weights for N and O and molecular weight for H2. Correction yields 1.9 g/mol. Oh bother. 14.4 is 20% N 80% O. With 15.6 I get...2.06 g/mol. Still a 3% error. What am I doing wrong? -R -- "We've all heard that a million monkeys banging on a million typewriters will eventually reproduce the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true." -- Robert Wilensky, UC Berkeley _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
