Mole A mole is just a number pair = 2 trio = 3 quartet = 4 dozen = 12 mole = (mol) 602000000000000000000000 Mole A mole is just a number pair = 2 trio = 3 quartet = 4 dozen = 12 baker’s dozen = 13 gross = 144

Avogadro’s Number 6.02x1023

9.12 x 1013 How BIG is a mole? There are ~ 6.6 billion people on Earth How many Earths would it take to equal the population of 1 mole? 9.12 x 1013

If you had a mole of cats . . . They would create a sphere larger than Earth!

If you had a mole of $$$$$ and you spent $800 billion dollars a day how many years would it take to spend a MOLEion dollars? 2.06 x 109 years

If you had a mole of H2O could you swim in it?

Water molecules are so small NO! Water molecules are so small that a mole of H2O = 18ml

How small are atoms? There are more atoms in one gram of salt than grains of sand on all the beaches of all the oceans in all the world.

Just one granule of sugar contains 1 x 1017 molecules Each time you take a breath of air, you inhale about 2 x 1022 molecules of nitrogen and 5 x 1021 molecules of oxygen.

In chemistry we don’t work with individual atoms or molecules because they are too small to be weighed or measured We have to work with LOTS of atoms in order to measure them THAT’s WHERE THE MOLE COMES IN!

The next slide is SO important to chemistry.

of the in Gram ATOMic Mass mass in grams of 1 mole of atoms of an element In other words…… 1 mol C atoms = 6.02 x 10 23 C atoms = 12g C

Practice Remember. 1 mole = 6 Practice Remember . . . 1 mole = 6.02x1023 atoms or molecules = ______ g from the periodic table

Stoichiometry of Chemical Formulas

Gram Formula Mass Gram Molecular Mass Molar Mass of the in Gram Formula Mass Gram Molecular Mass Molar Mass mass in grams of 1 mole of a substance In other words . . . Add it all up! 1 mole of NaCl = 58g = 6.02x1023 particles of NaCl 1 mole of H2O = 18g = 6.02x1023 molecules of H20

Now….. Use the gram formula mass and the gram atomic mass to determine how many moles or atoms of an element are found in some mass of a substance how much mass that element contributes to the mass of the entire substance Use factor label & follow the units!

Stoichiometry of Chemical Formulas If you have 1 molecule of (NH4)2SO4 How many atoms of N are there? How many atoms of H? SO….. If you have 1 mole of of (NH4)2SO4 How many moles of N are there? How many moles of H?

Practice Remember. 1 mole = 6 Practice Remember . . . 1 mole = 6.02x1023 atoms or molecules = ______ gfm from the pt

1 mole = 6.02x1023 atoms or molecules = gfm = 22.4L (g) Remember . . . 1 mole = 6.02x1023 atoms or molecules = gfm = 22.4L (g)

The End