Distance between water molecules.

[robertsa]

Homework Statement

There are 3.344 x 10^25 molecules in 1 kg (1 litre) of water. What is the distance between the molecules?

Homework Equations

The Attempt at a Solution

I found the density of water in kg/m^3, then found # moles in 1 litre (55.6) and then from that using Na I found the # of molecules. I am unsure of where to go next with finding the distance betwee them.

 

[ehild]

Assume that all molecules occupy identical cubic cells. (They vibrate, rotate, do Brown motion, so this volume is not the same as their actual size) How much volume does a molecule own? Imagine that each molecule occupies the centre of a its own cell. What is the length of one side of a cube and what is the distance between the neighbouring centre?

ehild

 

[Borek]

https://www.physicsforums.com/showthread.php?t=348414

Almost the same problem.