Chemistry The average separation between H2O molecules in pure water

[Tom_Sg]

Homework Statement

I can't answer to that question, and I don't know how to. I have to calculate the average separation between H2O molecules in pure water.

Homework Equations

The diameter of the molecule is 0.29 nm

I think we can use the bohr equation to resolve it? r = (ε₀*h²) / (π*m*e²)

I also found this : ω (which is the average spacing) = 1/n = 4π/3=r₀³ (from here)

The Attempt at a Solution

I don't know.- I don't want the answer just some clue to get the answer. :)

Thank you.

 

[M Quack]

Using the density and the mass per molecule, you can figure out the number of molecules per, say 10 x 10 x 10 nm...