This document contains information about stoichiometry including homework solutions, key terms, units, and examples of concentration calculations. It defines concentration as the number of particles of solute per solvent and provides examples of converting between units of volume and calculating concentration given the moles of solute and volume of solution. The document serves as a reference for learning about stoichiometry, concentration, and performing concentration calculations.

2. LETS CHECK HOMEWORK, EXERCISE 2.6
QUESTION 1:
1.1 ANSWER = 28g
1.2 ANSWER = 87g
1.3 ANSWER = 224g

3. LETS CHECK HOMEWORK, EXERCISE 2.6
QUESTION 2:
2.1 ANSWER = 40g
2.2 ANSWER = 180g
2.3 ANSWER = 40g

4. THE MOL CALCULATOR (RECAP &
OUTCOMES)
U already know the following
terminologies
Molar Mass
Mass
Mol
Total number
of molecules
Use Mol Ratio
Derive Formula
The new Terms that you are
going to work with today
Concentration
Conversion of units
Volume

5. SYMBOLS AND UNITS FOUND IN
STOICHIOMETRY
Quantity Symbol SI-Unit
Mol n mol
Mass m g
Molar Mass M 𝑔. 𝑚𝑜𝑙−1
Volume V 𝑑𝑚3
Concentration c 𝑚𝑜𝑙. 𝑑𝑚−3

6. WHAT IS CONCENTRATION
• THE CONCENTRATION OF A SOLUTION IS A MEASURE OF
THE NUMBER OF PARTICLES OF THE SOLUTE IN THE SOLVENT.
• A CONCENTRATED SOLUTION WILL HAVE
A LARGE NUMBER OF PARTICLES OF THE SOLUTE IN THE SOLVENT.
• A DILUTE SOLUTION WILL HAVE
A SMALL NUMBER OF PARTICLES OF THE SOLUTE IN THE SOLVENT.
the amount of a
substance per
defined space.

7. HOW TO CONVERT UNITS OF
CONCENTRATION
X 1000 X 1000
𝑚3 −−−−−−−−−−−→ 𝑑𝑚3 −−−−−−−−−→ 𝑐𝑚3
𝑚3
<−−−−−−−−−− − 𝑑𝑚3
<−−−−−−−−−−− −𝑐𝑚3
/ 1000 /1000
1 𝑐𝑚3
= 1 ml
1 𝑑𝑚3
= 1 l

8. EXAMPLES OF UNIT CONVERSIONS
• 0,6𝑚3
TO 𝑑𝑚3
• = 600 𝑑𝑚3
• 25 𝑐𝑚3
TO 𝑑𝑚3
• = 0,025 𝑑𝑚3
• 3000 𝑐𝑚3
TO 𝑑𝑚3
• = 3 𝑑𝑚3
• 5,5 𝑚3
TO 𝑑𝑚3
• = 5000𝑑𝑚3

9. EXAMPLES OF DETERMINING
CONCENTRATION
• 1, DETERMINE THE CONCENTRATION OF 6 GRAMS OF 𝐻2 𝑂 IN THE FOLLOWING EQUATION, FOUND IN A 2L
CONTAINER
2KOH + 𝐻2 𝑆𝑂4 −−→ 𝐾2 𝑆𝑂4 + 2𝐻2 𝑂STEPS
1- BALANCED?
2-DETERMINE THE MOL
(NEED MOLAR MASS
AND MASS)
3- CONCENTRATION
(NEED MOL AND
VOLUME)

10. • 2, DETERMINE THE CONCENTRATION OF KOH FORMED WHEN 32g OF
𝑲 𝟐 𝑺𝑶 𝟒REACTS IN A 10 000ml CONTAINER.
2KOH + 𝐻2 𝑆𝑂4 −−→ 𝐾2 𝑆𝑂4 + 2𝐻2 𝑂
STEPS
1- BALANCED EQUATION
2-DETERMINE THE MOL
(NEED MOLAR MASS
AND MASS)
3- RATIO
4- CONCENTRATION
(NEED MOL AND
VOLUME)

11. HOMEWORK

12. REFERENCES
• HTTP://WWW.GCSESCIENCE.COM/M28.HTM
• HTTP://CHEMISTRY.ABOUT.COM/OD/CHEMISTRYGLOSSARY/G/CONCENTRATION.HTM