The Mole Concept allows chemist to be able to keep track of base units (basic particles) that are have such a small mass and a significant number of them that you can not count or mass them individually. So, instead we group them into large number sets, specifically 6.02E23 number sets or more commonly called a mole. So, the counting/number relationship (conversion factor) is

6.02E23 atom = 1.0 moles of the atom

So, this is the relationship that we will use to go from Mole -> numbers (base units) or numbers (base units) --> moles

The method of calculating these problems are same as any other problem you have done to date in the chemistry class, either Dimensional Analysis (DA) or by Equation.

Since we have several base units, we create a general name, called particle so we can create one conversion factor/Equation and have a reference table to make it specific for each type of substance.

The conversion factor is:

1mole

or by Equation

__#particle__ = #mole

__6.023E23 particle__

1mole

where when you know the substance you are dealing with, you replace the word "particle" with the appropriate base unit name from the table below.

Example, if you are dealing with a MC (molecular compound), you will replace particle with molecules

## Particle Name Table |
|||||||
---|---|---|---|---|---|---|---|

Substance | Particle Name | ||||||

Element | atom | ||||||

MC | molecule | ||||||

IC | Formula unit | ||||||

- MC - Molecular compound, IC - Ionic compound

- [Example of Actual Calculations of One Step Mole Problem Number], this will provide an example of the work needed for these problems (also will provide a better view of the Mole Counting/number Equation.

- Example of One Step Mole Problems - Numbers (this is a blank copy of the example problem just in case you want to do the math yourself.

- This is the homework for this section. Answer to the homework are on the bottom of this webpage, One Step Mole Problems for Elements - Numbers.