10.1. The Mole Concept http://www.ck12.org
FIGURE 10.3
The animal mole (left) is very differ-
ent than the counting unit of the mole.
Chemists nonetheless have adopted the
mole as their unofficial mascot (right).
National Mole Day is a celebration of
chemistry that occurs on October 23rd
(10/23) of each year.MEDIA
Click image to the left for more content.Watch a video that shows an experimental calculation of Avogadro’s Number: http://www.youtube.com/watch?vp9
QYJqFq5s.
MEDIA
Click image to the left for more content.Video experiment questions:
- Briefly describe this experiment.
- Write the calculations shown in this experiment.
- What was the experimental result?
- What was the percent error?
Conversions Between Moles and Number of Particles
Just as we did with dozens of bananas, we can use the number of items in a mole to convert back and forth between
a number of particles and moles of those particles.
Sample Problem 10.1: Converting a Number of Particles to Moles
The element, carbon exists in two primary forms: graphite and diamond. How many moles of carbon atoms are in a
sample containing 4.72× 1024 atoms of carbon?
Step 1: List the known quantities and plan the problem.
Known
- number of C atoms = 4.72× 1024