jermy - 4-7-2013 at 04:01
which law states that the amount of gas dissolved in a liquid is proportional to its partial pressure?
Please help me..
chemistry
jermy - 4-7-2013 at 04:04
what is the number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature ?
Thank u in advance
stefen - 4-7-2013 at 04:06
Hi Jermy,
Henry's law states that the amount of gas dissolved in a liquid is
proportional to its partial pressure.
Referrence: http://physics.tutorvista.com/thermodynamics/gas-laws.html
Thank you
stefen - 4-7-2013 at 04:18
Hi,
At room temperature 6.023 x 10^19 number of water molecules are present in a drop of water .
Referrence: http://chemistry.tutorvista.com/inorganic-chemistry/molar-ma...
Thank you
adamsium - 4-7-2013 at 04:41
That would be an extremely small drop of water. A drop of water is generally considered to be roughly 0.05 mL in volume, though this, of course,
depends on the size of the dropper opening, etc. Your drop is around 1/28th of this volume.
Also, the number would be ever so slightly less than stefen's answer, as the density of water at 20 C is not quite 1.00 g/mL. However, given that your
drop size happens to be almost exactly 1/10,000 of a mole, this should have been very easy to calculate, at least approximately, mentally, without
requiring much thought at all.
In future, please make at least some attempt to answer such questions yourself. Spoonfeeding and requests for such are frowned upon by
most members of this forum and this is not supposed to be a free source of people to perform your basic calculations at your beck and
call.
Endimion17 - 4-7-2013 at 04:42
What is this, SM has turned into Homework For Lazy Students?
woelen - 4-7-2013 at 04:58
Next time please do the following:
1) Try to do some work yourself first and show us where you get stuck.
2) Do not make similar threads with the same title, but combine things in a single post.
0.0018 ml of water is 0.0018 gram of water. One mole of water is 18 grams of water, so your (very small) drop of water contains 0.0018/18 = 0.0001
mole of water.
One mole is 6.02*10²³, so you have 6.02*10²³*0.0001 molecules of water.
[Edited on 4-7-13 by woelen]
Eddygp - 10-7-2013 at 00:55
How is this in chemistry in general and not in beginnings?