How much is…How much is…
a MOLE is just a number pair =
trio = quartet = dozen = baker’s dozen = gross = ream =
23
412 13144500
LOL YOU FUNNY
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?
• 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?
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.
• 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 Mole = Avogadro’s Number
•Definition: a chemical mass unit, defined to be 6.022 x 1023 molecules , atoms, or formula units .The mass of a mole is the molar mass of a substance.
(UNITS = g/mol)
Representative Particles
The smallest pieces of a substance:1) For a covalent compound: it is the
molecule.2) For an ionic compound: it is the
formula unit (made of ions).3) For an element: it is the atom.
• Remember the diatomic elements!
Hello Ladies here is my number…..6.02x1023
Avogadro’s Number is named in honor of the Italian chemist Amadeo Avogadro (1776-1855)…though he didn’t discover it.
Avogadro’s Number
<-----Jean Perrin
Avogadro's law
States that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules
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
check the periodic table yo!
Practice How many molecules of CO2
are in 4.56 moles of CO2?
How many moles of water is 5.87 x 1022 molecules?
Practice How many molecules of CO2
are in 4.56 moles of CO2?
How many moles of water is 5.87 x 1022 molecules?
2.75 x 1024 molecules
0.0975 mol or (9.75 x 10-2)
Practice problems How many atoms of carbon
are in 1.23 moles of C6H12O6?
How many moles is 7.78 x 1024 formula units of MgCl2?
4.44 x 1024 atoms C
12.9 moles