1. RELATIONSHIP BETWEEN
“MOLE” AND “MASS”
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2. Mole of element / molecule
• 1 mole atom of element /
molecule have 6.02 x 1023
particles.
b) Scientist found that:
i) mass of 1 mole atom of any
element is Relative Atomic
Mass in gram. 2

3. ii) mass of 1 mole atom of any
molecule is Relative
Molecular Mass or Relative
Formula Mass in gram.
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4. Mass of 1 mole atom of:
iv)element = Relative Atomic
Mass in gram.
ii) molecule = Relative Molecular
Mass / Relative
Formula Mass in
gram.
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5. For example (element):
Relative Atomic Mass of
sodium (Na)
= 23 g/mol
So, the mass of 1 mole
atom of sodium (Na)
= 23 g
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6. Try it yourself!!
Relative Atomic Mass of
magnesium (Mg) = 12 g/mol
So, the mass of 1 mole atom of
magnesium (Mg)
= 12 g
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7. How about this?
The mass of 1 mole atom
of argentum (Ag)
= 47 g
So, the Relative Atomic
Mass of argentum (Ag)
= 47 g/mol
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8. For example (molecule):
Molecular formula of carbon
dioxide = CO2
Relative Molecular Mass of CO2
= (12 X 1) + (16 X 2) = 44 g/mol
So, the mass of 1 mole CO2
= 44 g
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9. Try it yourself!!
Relative Molecular Mass
of NaCl = 23 + 35.5
= 58.5 g/mol
So, the mass of 1 mole
of NaCl
= 58.5 g
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10. How about this?
Relative Molecular Mass of KCl
= 19 + 35.5 = 54.5 g/mol
So, the mass of 1 mole of KCl
= 54.5 g
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11. MASS:
Mass of Number Relative
= X Atomic
element of mole
in gram of element Mass of
the element
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12. Number of = mass of element in gram
moles of Relative Atomic Mass
element
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13. X Relative Atomic Mass
Mole of element Mass of element
/ Relative Atomic Mass
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14. MOLE:
Relative
Molecular
Number
÷
Mass of Mass@Relative
of mole =
molecule Formula
of molecule in gram Mass of
the molecule
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15. X Relative Molecular Mass
Mole of molecule Mass of molecule
÷ Relative Molecular
Mass or Relative
Formula Mass
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16. Example 1:
What is the mole of 18
g of water? Calculate
the molar mass of the
water.
[Relative Atomic Mass:
H=1; O=16]
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17. Answer:
Number of mole of water
= mass of H2O in gram
relative molecular mass
= 18 g
18 g/mol
= 1 mole
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18. Molar mass of water
= mass of 1 mole of
molecule
= 18 g
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19. ACTIVITIES
TIME!!
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20. That’s all for
today!
Thank you!
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