Could you determine the amount of atoms in a substance?
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Could you determine the amount of atoms in a substance? How do scientists count when atoms and molecules are so small?. Using the concept of counting by weight Could you determine the amount of atoms in a piece of copper?. What information would you need?.

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Could you determine the amount of atoms in a substance?

How do scientists count when atoms and molecules are so small?


Using the concept of counting by weight Could you determine the amount of atoms in a piece of copper?


What information would you need

What information would you need? the amount of atoms in a piece of copper?

The periodic table has a secret! It can tell you the amount of atoms in a specific mass of each element


  • Look at the the amount of atoms in a piece of copper?amu of copper. The amu also describes the number of atoms in a specific mass in g

  • Ex: There are 6.02 X10 23 atoms/63.546 g of copper

  • Could you determine the amount of atoms in any piece of Copper?

  • Go ahead…..


  • 6.02 X10 the amount of atoms in a piece of copper?23 is a huge number!!!

  • It is a unit of measurement that scientists use. Just as chefs use the dozen (12)

  • This is manageable because atoms are so tiny

  • They call this number a mole!! (sometimes abbreviated mol)

  • With this new information could you determine the amount of moles if I gave you a specific mass of an element?

  • Write a conversion you could use.

  • Ex If I have .500g Al 1mol/26.98g How many mols do I have try it…

  • .500g Al 1 mol/26.98g = .0185 mols of Al


  • If I gave you the amount of the amount of atoms in a piece of copper?mols could you give me the mass?

  • .496 mols of Al 26.98g Al/1 mol = 13.4 g Al

  • If I gave you the number of atoms could you determine the mass?

  • Remember there are 6.02 X10 23 atoms in a mol and the molar mass is the mass of one mole

  • Find the mass of 2.03 X10 23 atoms of S

  • 2.03 X10 23 atoms S 1 mol/6.02 X 10 23 atoms S 32.055g S/1 mol

  • Answer = 10.8 g S


The number on the periodic table is called the MOLAR MASS. This gives you the mass in one mole of a substance.

Find the molar mass of O,S,N,F

Find the molar mass of H2O, HF


Can you find the mass of a particular amount of atoms
Can you find the mass of a particular amount of atoms? This gives you the mass in one mole of a substance.

Find the mass of 2.03 X10 23 atoms of S

2.03 X10 23 atoms S 1 mol/6.02 X 10 23 atoms S 32.055g S/1 mol

Answer = 10.8 g S


Moles from atoms
Moles from Atoms? This gives you the mass in one mole of a substance.

  • Could you determine the amount of moles if I gave you the amount of atoms?

  • 3.02 X 10 23 atoms of Ca is how many moles?

  • 3.02 X10 23 atoms Ca 1 mol/ 6.02 X 10 23 atoms Ca = .502 mols Ca


Could you determine the amount of atoms in a specific amount of moles
Could you determine the amount of atoms in a specific amount of moles?

  • 2.3 mols of Sr

  • 2.3 mols 6.02 X 10 23 atoms/1 mol = 1.4 X 10 24 atoms


How about the number of atoms in a specific amount of mass
How about the number of atoms in a specific amount of mass? of moles?

  • 345 g of Ca

  • 345 g Ca 1 mol/40.078g 6.02 X 10 23 atoms/1 mol


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