the+mole+concept+including+empirical+and+molecular+formulas,+percentage+composition,+Avogadro’s+constant


 * //The mole concept// **


 * Videos**

Moles and molecules || media type="custom" key="23092534" The mole and Avogadro's constant || media type="custom" key="23092552" Molar mass calculations ||
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Empirical and molecular formulae with worked examples & practice questions || media type="custom" key="23211060" Interesting look at the definition of a kg & how Avogadro's number might define it instead of the other way around ||
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 * Common Misconceptions:**
 * Moles and molecules are the same thing and can be used interchangeably.
 * If a calculated empirical formula is the same for 2 compounds, then they are the same compound.
 * Molar mass and mole can be used interchangeably.


 * Interesting Facts:**
 * 1 mole of Sodium Chloride (salt) = 58.5 grams.
 * When calculating empirical formula, you can use percentage composition
 * 1 mole of marshmallows would cover Australia to a depth of 900 km!
 * The molar mass of an element is the relative atomic mass of the element expressed in grams.


 * Resources:**
 * General Chemistry Online's resource on the Mole Concept.
 * Empirical Formula Calculator from the University of Sydney.