# Which contains more molecules of water: 5.00 #cm^3# of ice at 0°C or 5.00 #cm^3# of liquid water at 0.°C? How many more? What is the ratio of the numbers of molecules in these two samples?

##### 2 Answers

You could have quoted the densities of ice and water at the given temperatures....

#### Explanation:

So we will have to get these data...shortly. You add an ice cube to a glass of water...the ice FLOATS.....you sail your luxury liner thru the North Atlantic, you do run the risk of ramming an ice-berg. And so clearly, LIQUID WATER is DENSER than SOLID ICE under normal conditions, and this is on what the question depends... This is an UNUSUAL property, which is why it is emphasized in your syllabus...to illustrate the unusual properties of water...

A

This site quotes the density of ice as...

You can do the ratio...

Liquid water contains

The ratio of molecules of liquid water and water ice is

#### Explanation:

First we will use density to determine the mass of each volume. Then we can use mass and molar mass to determine the number of moles. Then we can calculate the number of molecules by multiplying the moles by

**WATER ICE**

The density of water ice at

where

To get mass, multiply

To get moles of ice, divide the mass of liquid water by the molar mass of water

To calculate the number of molecules of ice, multiply mol

**LIQUID WATER**

The density of liquid water at

To get moles of water, divide the mass of liquid water by the molar mass of water

To calculate the number of molecules of liquid water, multiply mol

**DIFFERENCE IN NUMBER OF MOLECULES**

**RATIO**

We can just divide the coefficients since the exponents are the same.

Ratio of molecules of liquid water to water ice is: