Am i in the right place?

  • Thread starter mh922253
  • Start date
  • #1
mh922253
6
0
am i in the right place?

i everyone i have a physics question but i am not sure if i am in the right place or not... the question is:
Estimate the number of water molecules in a raindrop 1.5 mm in radius.
i really don't want you to solve it just give me the equation that i am supposed to use to solve the question...

and again... if i am in the wrong place...please tell me where i am supposed to post this question

thanks a lot
 

Answers and Replies

  • #2
DaveC426913
Gold Member
21,179
4,612
This is better posted in the homework forum.

Look up the molar volume of water. You'll find out how many atoms fit into a given volume. The rest is just volumetric calculation.
 
  • #3
LeonhardEuler
Gold Member
860
1
The density of water is 1 gram per cubic centimeter. The molecular mass of water is about 18 grams per mole. there are about 6.02*10^23 molecules in a mole. Assuming the raindrop is spherical, you can find its volume from [itex]V=\frac{4}{3}\pi r^3[/itex]. Using the desnity, you can find the mass, using the mass you can find the # of moles, using the # of moles you can find the # of molecules.
 

Suggested for: Am i in the right place?

Replies
2
Views
297
  • Last Post
Replies
8
Views
389
Replies
10
Views
294
Replies
8
Views
349
Replies
8
Views
100
Replies
7
Views
483
Replies
13
Views
553
  • Last Post
Replies
4
Views
158
Replies
33
Views
1K
Top