The document provides instructions for conducting an experiment to measure the mass of paper clips using a balance and compute the number of paper clips in a handful based on the average mass. It asks students to record their results in a table and compare the computed number of paper clips to the actual counted number, explaining any differences. It then provides background information on moles as a unit of measurement in chemistry, defining it as 6.02 x 1023 particles and providing examples of converting between numbers of particles and moles for different substances using molar mass.

7. A PAIR = 2
A DOZEN = 2
A BOX = 100 OR 30 0R 50
A PINCH = ?
A BOWL = ?
A SACK = ?

8. 1. Measure and record the mass of 25 pcs. Paper clip using
the platform balance. Divide the mass obtained by 25 to
find the average mass of one Paper clip. Perform 3 trials.
Record your answers on a table.
2. Get a handful of paper clips and measure their mass.
Compute for the number of paper clips using your data
from step 1. Be sure to do it through computation and not
by counting.
3. This time, count the number of paper clips in the handful
paper clips in step 2.
4. Repeat steps 2 and 3 by getting different handful of paper
clips. Record your answers on a table.

9. Is the number of paper clips in
step 2 the same as the number of
paper clips in step 3? Why
do/don’t you think so?

10. The number of particles in
one mole of a substance

11. A very large number equal to
6.02 X 1023

12. So, a mole (mol) of a substance is a
representative particles of that
substance.

13. • A unit of measurement in the
International System of Units (SI) for
amount of substance.
• It is defined as the amount of a substance
that contains as many elementary entities,
e.g., atoms, molecules, ions, formula units,
as there are 12 grams of carbon-12 atom.

14. 1 mole of a substance
=6.02 X 1023 particles

15. 1 mole of C-12 atom =6.02 x 1023 particles = 12g
1 mole of H2O molecule = 6.02 x 1023 particles = 18g
1 mole of NH4+ ion = 6.02 x 1023 particles = 18g
1 mole of CaO formula units = 6.02 x 1023 particles =
36g

16. The mass of an element or compound depends on the
mass of the particles.
Therefore one mole of Carbon has a mass dependent on
its atomic mass – MOLAR MASS
MOLAR MASS = the mass in grams that is numerically
equal to the atomic mass. The unit of molar mass is
grams/mole (g/mol).

17. 1. How many molecules are there in 4.0 moles of CO2?
To answer this, you have to consider that 1 mole of CO2 is equal to 6.02
x 1023 particles of CO2.
Thus, using dimensional analysis approach, you will be able to convert
the number of mole to its equivalent amount in the number of particles.
4.0 moles of CO2 = 6.02 x 1023 particles = 2.41 x 1024 molecules of CO2
1 mole of CO2

18. 2. How many moles of H2O are there in 1.79 x 10 24 molecules of
H2O?
To answer this, you have to consider that 1 mole of H2O is equal to 6.02 x
1023 particles of H2O
Thus, using dimensional analysis approach, you will be able to convert the
number of molecules to its equivalent amount in the number of moles.
1.79 x 10 24 molecules of H2O= 1 mole of H2O = 2.97 moles of H2O
6.02 x 1023 molecules of H2O

19. 1.How many mongo seeds are equal to
3.50 moles of Mongo seeds
2. How many moles of rice grains are
equal to 1.807 x 10 24 grains of rice?

20. 1.How many bananas are equal to 7.50
moles of Bananas
2. How many moles of tomatoes are in
3.01 x 10 23 pieces of tomatoes?

21. “ Even a small act of kindness will make a
great difference in people’s lives…” THANK
YOU!