The Mole

different units of measure 1 dozen eggs = 12 1 gross of pencils = 144 1 ream of paper = 500 sheets Things are measured in different units of measure 1 ton of gravel = 2000 pounds

The Mole Chemistry uses a special measurement called the “mole” This is a very big number….so important the number has a special name: AVOGADRO’S NUMBER

Avogadro’s number, the number of atoms in one mole, was estimated by making a one-atom layer of oil across the surface of a pond. Using the area covered by the oil, its mass, and an estimate of molecular length, a "ballpark figure" for Avogadro's number was calculated.

number of atoms (or molecules) A mole is the number of atoms (or molecules) in these samples A mole of sulfur, iron, and mercury

602,000,000,000,000,000,000,000 1 Mole = (6.02 X 1023) “things” atoms, molecules, electrons etc. How big is a mole...

cover the earth to a depth A mole of pennies would cover the earth to a depth of 300 meters

One mole of high school textbooks would cover the USA to a depth of about 320 km (200) miles.

A mole of marbles would spread over the surface of the earth, and produce a layer about 50 miles thick.

There is about 1 mole of stars in the universe.

A mole of dollars could not be spent at the rate of a billion dollars a day over a trillion years.

If one mole of particles the size of sand grains were blasted by an eruption from Mt. St. Helens, they would cover Washington State to the depth of a ten-story building.

Water flows over the Niagara Falls at about 172 million gallons per minute. At this rate it would take 134,000 years for one mole of water DROPS (6.023 X 1023 drops) to flow over the falls

One mole of marshmallows would cover the USA to a depth of 6500 miles.

Because one gumdrop weighs more than one jellybean, you can’t get equal numbers by taking equal weights.

Equal numbers of molecules each have their own separate weights

9.4 grams 13 grams A “roll” of dimes weighs 43 grams and contains 50 dimes. How much would 11 dimes weigh? A “roll” of nickels weighs 59 grams and contains 50 dimes. How much would 11 nickels weigh? 11 nickels X 59 grams X 1 roll = 1 roll 50 nickels 11 dimes X 43 grams X 1 roll = 1 roll 50 dimes 9.4 grams 13 grams

You can count molecules of air by knowing the volume of the air. 22.4 Liters of air is one mole of air at standard temperatures and pressures.

good chemistry site prentice hall pictures links for chemists The wired chemist Lecture notes on the mole chemdex