Am i in the right place?

  • Thread starter mh922253
  • Start date
  • #1
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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 dont 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
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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
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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.
 

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