Chemistry_BSC16
4
Lecturer: Dr. Ahmad
Mustafa
LA: Eng. Hoda Anwar
Course Contents
ILO’s for this Chapter
• Reviewing some engineering chemistry basics that relates
to the course progress.
• Identifying the measurement systems and differentiate
between units and dimensions.
• Explaining the difference between mole, molecular
weight and mass.
• Differentiate between molarity, molality and Normality.
What is the difference between Unites & Dimensions?
Mathematics and Engineering
• It is about consistency.
Common Systems of Units
• Let us practice:
• Convert 2200 ft/s to mi/h
2200 ft
1 mi
60 s
60 min
s
5280 ft
1 min
1h
• Convert 400 in3/d to cm3/min
400 in3
(2.54)^3 cm3
1d
1h
d
1 in3
24 h
60 min
Temperature Conversion
0 OC = 273 K = 492 OR
T (K) = 492/273 T(OR)
T (K) = 1.8 T(OR)
Example
• The temperature of ambient air in a certain location is
measured to be 25 ◦C. Express this temperature in
Fahrenheit (F), Kelvin (K) and Rankine (R) units
Amount of Substance
• What is Mole?
Molecular weight
• Calculate the molecular masses (g/mole) of:
• Sulfuric Acid (H2SO4)
• ammonia (NH3)
• Sodium sulfate (Na2SO4)
• Nitric acid (HNO3)
• [Atomic mass of N=14, Na=23, H=1, S=32, O=16)
Amount of Substance
• Calculate the number of moles of the following
substance
• 1-10 g of NaOH
• 2-100 ml of HCl
• 3-23 g of AgNO3
• [Atomic weight of Na=23, O=16, H=1, Cl=35.5,
Ag=108, N=14 g/mol]
• [density of HCl=1.18 g/ml]
Amount of Substance
• How many molecules are there in a drop of water weighting 0.05 g?
Example
• Acetylsalicylic acid C9H8O4 is the principle
ingredient of Aspirin. What is the mass in grams of
0.287 mole of Acetylsalicylic acid?
Equation Balancing
• Chemical equation must contain equal number of each
type of atom on each side.
• N2H4 (l) + N2O4 (l) → N2 (g) + H2O (g)
• Balance the following Equation
N2H4 (l) + N2O4 (l) → N2 (g) + H2O (g)
N2 (s) + H2 (g) → NH3 (g)
NaOH (s) + CO2 (g) → Na2CO3 (s) + H2O (l)
PH3(g) + O2(g) → P4O10(s) + H2O(g)
Equation Balancing - Exercise
• Chemical equation must contain equal number of each
type of atom on each side.
• N2H4 (l) + N2O4 (l) → N2 (g) + H2O (g)
• Balance the following Equation
2N2H4 (l) + N2O4 (l) → 3N2 (g) + 4H2O (g)
N2 (s) + 3H2 (g) → 2NH3 (g)
2NaOH (s) + CO2 (g) → Na2CO3 (s) + H2O (l)
4PH3(g) + 8O2(g) → P4O10(s) + 6H2O(g)
End of Chapter One
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