Introduction to the MOLE
The chemist’s quantitative system for
keeping track of representative
particles
What is a MOLE?
• A mole is _____________ items.
• Specifically, a mole is defined as the number
of __________ present in _____ grams of
____________________.
• And there are ______________________
atoms in _____ grams of
_________________.
Ranking Moles
• List the following substances in order of increasing mass of
one mole of the substance. In other words put a 1 under the
substance with the smallest mass for one mole and an 8
under the substance which would have the greatest mass for
one mole.
Carbon
Table Salt
Baking Soda
Water
Sucrose
Aluminum
Hydrogen Gas
Copper Metal
Just How Big is a MOLE?
• Just How Big is a Mole?
• *
If we were able to count atoms at the rate of 10 million per
second, it would take about ______________________ to count
the atoms in one mole.
• *
One mole of soft drink cans is enough to cover the surface of
the earth to a depth of over _____________________.
• *
If you had a mole of unpopped popcorn kernels, and spread
them across the United States of America, the country would be
covered in popcorn to a depth of over ___________________.
• *
If you were given a mole of pennies and required to spend 1
million $ per second for your entire life at age 100 you would have
__________________% of your money left.
• *
A mole of basketballs would create a new ______________
the size of the _________________.
Carbon-12 and Hydrogen-1
Carbon-12 = 12.0 amu
So one atom of Carbon-12 has the
same mass as 12 atoms of Hydrogen1.
Or you could say that one atom of
Carbon-12 is 12 times the mass of one
atom of Hydrogen-1
Hydrogen-1 = 1.0 amu
Carbon-12 and Hydrogen-1 Continued
So that must mean that 1 ______________ atoms of _____________ is
______ times the mass of 1_____________ atoms of ______________.
So that must mean that _________________ atoms of _____________ is
______ times the mass of _______________ atoms of ______________.
So that must mean that 1 ______________ atoms of _____________ is
______ times the mass of 1_____________ atoms of ______________.
THE LOGIC OF IT ALL
• One Mole of atoms of Carbon-12 has a mass
of _______ grams!!
• Therefore one mole of atoms of Hydrogen-1
has a mass of _______ gram!!
• The LOGIC:
• The mass of one mole of any element is simply
the atomic mass of that element expressed in
______________ (instead of _______)
The Mass of One Mole
• The mass of one mole of sulfur atoms is____ grams.
• The mass of one mole of helium atoms is____ grams.
• The mass of one mole of gold atoms is ____ grams.
• The mass of one mole of water molecules is
_______ grams.
MOLAR MASS
• Definition of Molar Mass
– The mass of _______ mole of any substance.
Or
– The mass of an ______________________ of
particles of any substance.
Now let’s go back to slide #3 and check how you did!
MOLAR MASS continued
• How do you calculate molar mass?
– For Elements – The molar mass is simply the
___________ mass from the
__________________ expressed in _________.
– For Compounds – The molar mass is simply the
sum of all the molar masses of the elements in the
compound -- Add ‘em up!!
Representative Particles Reminder
• What is the representative particle for each of
the following types of substances?
– ELEMENT
– MOLECULAR (COVALENT) COMPOUND
– IONIC COMPOUND