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2. DIRECTIONS: LOOK AT THE
STRUCTURAL DIAGRAM OF
HYDROCARBONS BELOW AND
ANSWER THE FOLLOWING
QUESTIONS.

3. A B C
Guide Questions:
1.Which of these sets of hydrocarbons is alkane?
2.Which of these are alkene and alkynes?
3.How will you describe the bond between B and C?
4.What elements are mostly present in all the three
given compounds?

4. Directions: Using the
counting units complete the
needed information in the
third column.

5. Items Counting Units Number in
Pieces
PAIRS
DOZEN
CASE
REAM
MOLE

6. Items Counting Units Number in
Pieces
PAIRS 2
DOZEN
CASE
REAM
MOLE

7. Items Counting Units Number in
Pieces
PAIRS 2
DOZEN 12
CASE
REAM
MOLE

8. Items Counting Units Number in
Pieces
PAIRS 2
DOZEN 12
CASE 24
REAM
MOLE

9. Items Counting Units Number in
Pieces
PAIRS 2
DOZEN 12
CASE 24
REAM
MOLE

10. Items Counting Units Number in
Pieces
PAIRS 2
DOZEN 12
CASE 24
REAM 500
MOLE

11. Items Counting Units Number in
Pieces
PAIRS 2
DOZEN 12
CASE 24
REAM 500
MOLE 6.02 X 1022

12. •Define Molecular mass
•Compute for the molecular mass
and;
•Apply the concept of molecular
mass in industry
OBJECTIVES

13. GROUP ACTIVITY
Compute the molecular
mass of the given
compounds.

14. Element Quantity Average
atomic
mass
Subtotal
X =
X =
X =
MOLAR MASS

15. MOLECULAR
MASS

16. MOLECULAR MASS
Molecular mass is the
sum of the atomic masses
of all atoms in a molecule.

17. MOLECULAR
 Determine the number of atoms of the elements present
in the molecule.
 Find the atomic mass of each atom using the periodic
table of elements. Multiply the atomic mass to the
number of atoms of the elements present in the molecule
 Get the sum of all the product.

18. •Mefenamic acid consist of
C13H18O2, a common compound
that is mostly used in pain
medication. What is the
molecular mass for this
compound?

19. Element Quantity Average
atomic
mass
Subtotal
Carbon 13 X 12.01 = 156.13
Hydrogen 18 X 1.01 = 18.18
Oxygen 2 X 16.00 = 32.00
MOLAR MASS 206.31
The molecular mass of mefenamic
acid (C13H18O2) is 206.31 g/mol

20. Directions: Solve the molecular mass
of the following compounds.
1. Ammonium Phosphate (NH4)3PO4
is a compound that is often used by
farmers as fertilizers. Calculate the
molecular mass?

21. 2. Caffeine is a natural compound
commonly found in coffee, tea,
chocolate, and softdrinks. What is
the molecular mass of caffeine
(C8H10N4O2)?

23. 1. Which of the following best define molecular mass?
A. Molecular mass is the sum of the atomic masses of
all
atoms in a molecule.
B. Molecular mass is the difference of the atomic
masses of all atoms in a molecule.
C. Molecular mass is the product of the atomic masses
of all atoms in a molecule.
D. Molecular mass is the quotient of the atomic masses
of all atoms in a molecule.

24. 2. How molecular mass is calculated?
A. Atomic mass of an element minus the number of atoms
as indicated by chemical formula.
B. Number of atoms as indicated by chemical formula
divided by atomic weight.
C. Atomic mass of an element multiplied by the number of
each atom of each element as indicated by chemical
formula then add all the products of all the elements.
D. Number of atoms as indicated by chemical formula
divided by atomic mass of an element.

25. 3. The pain reliever mefenamic acid contains
an active ingredient called Ibuprofen C13H18O2.
What is the molecular mass for this compound?
A. 200.0 g/mol
B. 206.3 g/mol
C. 222.3 g/mol
D. 240.54 g/mol

26. 4. Caffeine is a natural compound commonly
found in coffee, tea, chocolate, and softdrinks.
What is the molar mass of caffeine
(C8H10N4O2)?
A. 171.1 g/mol
B. 189.4 g/mol
C. 194.2 g/mo;
D. 199.8 g/mol

27. 5. Which of the following applies the concept of
molecular mass?
A. Preparation of medicine
B. Making of plastic products
C. Determining the component of compounds
D. All of the above

28. ASSIGNMENT
1. What is formula mass?
2. What are the steps in calculating
the formula mass of a given
compound?
Science 9, LM, pages 151 – 152.