RE: Chemistry quiz 2: win up to 6 steem! :)
I used to like Maths and not so much a Chem person but this looks more like a Maths problem so I decided to have some fun with this.
N2 percent in air： 75.518%
N2 mass 14.007 u
1g = 6.022 x 10^23 u
Air density: 1.2kg/m3
N2 presence = 7.79215 x 10^26 molecules
Room area in meter square = 4 x 4 = 16
Height of room in meter = H
Volume of air in room = 16 x H
Mass of air in room in kg = 16 x H x 1.2
Mass of N2 in room in g = 75.518% * 16 * H * 1.2 * 1000
Mass of N2 present in g = （7.79215 * 10^26 * 14.007 ）/ (6.022 * 10^23 )
Solving for H...
Mass of N2 in room in g = Mass of N2 present in g
75.518% * 16 * H * 1.2 * 1000 = （7.79215 * 10^26 * 14.007 ）/ (6.022 * 10^23 )
Therefore Height of room in meters (H) = 1.25m
By logic the height seems low. Maybe, I went wrong somewhere if I'm wrong but perhaps give some clue to the next guy. :-)
You are very close ... Read carefully again how I exactly formulated "Given as help" ...
(I will be offline for quite a while now, just in case you wonder, if I don't reply immediately to your next try - good luck! :)
Sorry, I have to give up. I think its the quadratic thing that I don't get.
@ace , the only mistake which you made was that you used the mass of a single N atom instead of the mass of N2.
I feel a little bit sorry that you didn't win the prize because you were the first one with a nearly correct solution. At least I upvoted all your comments with 100 % as compensation. :-)
Understood. I'm off because of N2. All for the fun anyway so it's ok. That why i have the details so someone could figure out the right answer and enlighten me. So, my maths is still good . My chem still no good. :-)
Thanks. I think I took into account of those.
Will relook a bit.