Where go the number 6.02 × 1023 come from? go chemists simply pull that number the end of slim air? Of course not! The isotope carbon 12 has 6.02 × 1023 carbon atoms in a 12 gram sample. So, 12 grams the carbon minus 12 equates to one mole of carbon-12. The variety of atoms in 12 grams the carbon-12, or 6.02 × 1023, was collection as Avogadro’s number.

Let’s think about Avogadro"s number in regards to the macroscopic world.

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If you had actually a mole the pennies, friend would have actually 6.02 × 1023 pennies. That is a lot of pennies. If a solitary mole the pennies to be divided among all the living human being in the world, every person might spend a million dollars every hour for the rest of his or her life.


Now imagine a mole that sand particles. That would be 6.02 x 1023 seed of sand. How large would it be? If girlfriend put every one of that sand in a cube shame box, it would be around 4,400 meters tall, 4,400 meters large and 4,400 meters deep. It would certainly dwarf the Astrodome and Reliant stadion in Houston (to the left).

The image below shows what the mole that sand would certainly look prefer if you to be flying indigenous west to eastern toward Houston.


Fortunately, you only use mole to measure quantities of particles such together ions, atoms, molecules, and formula units. These particles room so tiny that a mole that sulfur, oxygen, sodium chloride, or other substance is a reasonable amount.



What execute you notice about the variety of grams in one mole that the elements listed above and the atom masses that the elements?

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They room the same.

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For any type of element, a mole is the atom mass expressed in grams.

What around compounds such together glucose, C6H12O6? how much is one mole that glucose?

One mole the glucose is 180 grams.

For any kind of compound, a mole is the formula, or molecule mass, in grams. We have the right to use a table favor the one listed below to determine the complete mass that glucose.

Element Atomic fixed (from the routine table) Multiplied by # of atoms current in the compound total mass of each facet present in the compound
180.0 grams

What about a mole that a gaseous facet or compound? exactly how do us measure a mole the oxygen, because that example? Fortunately, you deserve to use volume to measure up moles of gas. In examining the nature of gases, Amadeo Avogadro found that equal volumes of various gases at the exact same temperature and pressure have actually the same variety of particles.

One mole of any gas at a traditional temperature and pressure has actually a volume the 22.4 liters.

Why do chemists usage the mole?

Let’s speak you are conducting a activities exercise whereby you are required to measure one mole of sulfur. Might you count out 6.02 × 1023 atom of sulfur? No, you could not, yet you can mass the end 32.06 grams the sulfur. Girlfriend now know that 32.06 grams of sulfur would certainly equal one mole!

Sources of photos used for this ar as they appear, optimal to bottom:

Pennies, The an excellent Penny pick Up Created with Google Earth and Google SketchUp Moles of elements, Dynamic science