Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 7  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading

spacer7.1 Calculation of
spacerFormula
spacerMass

spacer7.2 Mole
spacerConcept

spacer7.3 Atomic Mass
spacerRevisited

spacer7.4 Calculation of
spacerMolar Mass
spacer
7.5 Calculations
spacerinvolving
spacerAvogadro #

spacerMass to mole conversion and vice-versa
spacermole to number of particles conversion and vice-versa
spacerMass in grams to number of particles conversion
spacer
7.6 Molar Volume
spacerof a Gas
spacerMolar volume calculations
spacer
7.7 Percent
spacerComposition
spacer
7.8 Empirical
spacerFormula

spacer7.9 Empirical
spacerMass to
spacerMolecular
spacerFormula



spacerProblems
spacer1 | 2
| 3 | 4 | 5

Unit #7 CALCULATIONS BASED ON FORMULAE

7.5 - Calculations involving Avogadro's number

7.5.1 - Mass to mole conversion and vice-versa

Whenever you want to convert quantities from one unit to another, you need to use the appropriate conversion factor. The conversion factor must have units of the two quantities involved.

To convert between mass in grams and moles,


Conversion factor is:

atomic mass (section 7.3) or molar mass (section 7.4)

because these quantities relate grams to moles since atomic mass or molar mass have units of

To convert:


  1. you need to multiply by the atomic mass of the atom.

  2. you need to divide by the atomic mass of the atom.

Click to see a detailed summary.



  1. you need to multiply by the molar mass of the molecule.

  2. you need to divide by the molar mass of the molecule.

Click to see a detailed summary.

Section 8.2
Calculation of Moles of Units. Avogadro's Number (N) ..p189

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