3.3 (b) relative atomic mass
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Transcript of 3.3 (b) relative atomic mass
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RELATIONSHIP BETWEEN “MOLE” AND “MASS”
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a) 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.
Mole of element / molecule
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ii) mass of 1 mole atom of any molecule is Relative
Molecular Mass or Relative Formula Mass in gram.
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Mass of 1 mole atom of:
i) element = Relative Atomic Mass in gram.
ii) molecule = Relative Molecular
Mass / Relative
Formula Mass in
gram.
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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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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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How about this?
The mass of 1 mole atom of argentum (Ag)
= 47 gSo, the Relative Atomic Mass of argentum (Ag)
= 47 g/mol
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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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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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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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Mass of
element
in gram
Number
of mole
of element
X=Relative
Atomic
Mass of
the element
MASS:
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Number of = mass of element in gram moles of Relative Atomic Mass element
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Mole of element Mass of element
X Relative Atomic Mass
/ Relative Atomic Mass
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Number
of mole
of molecule
=Mass of
molecule
in gram
Relative
Molecular
Mass@Relative
Formula
Mass of
the molecule
MOLE:
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Mole of molecule
X Relative Molecular Mass
Mass of molecule
Relative Molecular
Mass or Relative
Formula Mass
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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]
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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Answer:
Number of mole of water
= mass of H2O in gram
relative molecular mass
= 18 g
18 g/mol
= 1 mole
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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Molar mass of water = mass of 1 mole of
molecule = 18 g
Molar mass of water = mass of 1 mole of
molecule = 18 g
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ACTIVITIES
TIME!!
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That’s all for today!
Thank you!