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## Homework Statement

Estimate the bond energy between two water molcules (liquid) in the following way

A: From the density of water and its molecular weight calculate the average distance between the molecules

B:hence show that there are 10^19 molcules per m^2 of surace

C:from the suraface tension of water, assuming this to be the same as the suraface energy, fine the value of U_0

## Homework Equations

[tex]N_s ≈ \frac{1}{r_0^2} \\

\frac{1}{4}nU_0N_s \\

\gamma = \frac{F}{L} \\

[/tex]

## The Attempt at a Solution

I am stuck straight away on part A. I know the density of water (1000 kg/m^3) and the molecular weight of H2O is 18 but have no idea how these are supposed to help me calculate the average distance between the molecules.

I am not looking for the answer but any hints on where to start would be very much appreciated.