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 #7CALCULATIONS BASED ON FORMULAE

7.5 - Calculations involving Avogadro's number

As chemists, we need to be able to answers questions of this type:

" How many oxygen atoms are there in 5.0 grams of Na2CO3?"

" 5 moles of electrons is equivalent to how many electrons?"

" How much volume does 2.5 moles of CO2 gas occupy at STP?"


Avogadro's number allows us to carrying out calculations between:

  1. grams
  2. moles
  3. number of particles (eg - these can be # of electrons, # of atoms, # of ions, # of molecules ... etc ...)

How do we do this?

  • In the next section, section 7.5.1 we will learn how to convert between mass (in grams) and moles.
  • In the next section, section 7.5.2 we will learn how to convert between moles and number of particles.
  • In the next section, section 7.5.3 we will learn how to convert between mass (in grams) and number of particles.

Place your mouse over the image below to see the content of the sections diagrammatically. Click on the portion of the image to jump to the section.

Read on ....

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

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