CHEM 0010 Unit


UNIT # 7
Introduction
Objectives
Reading
7.1 Calculation of Formula Mass 7.2 Mole Concept 7.3 Atomic Mass Revisited 7.4 Calculation of Molar Mass 7.5 Calculations involving Avogadro # 7.6 Molar Volume of a Gas 7.7 Percent Composition 7.8 Empirical Formula 7.9 Empirical Mass to Molecular Formula
Problems 1 \| 2 \| 3 \| 4 \| 5

CALCULATIONS BASED ON FORMULAE

7.5 - Calculations involving Avogadro's number

7.5.2 - Moles to number of particles 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 moles and number of particles^*,
(Note that both "moles and "number of particles" are counting units.)

^* particles can be protons, electrons, atoms, ions, molecules, etc ...

Conversion factor is:

Avogadro's number (section 7.2)

because Avogadro's number relates moles to number of particles. It has units of

To convert:

you need to multiply by Avogadro's number.
you need to divide by Avogadro's number.

Click to see a detailed summary.

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

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