Chem You can start coming in during help session to work on test corrections. Today: Introduction to the Mole.

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Presentation transcript:

Chem You can start coming in during help session to work on test corrections. Today: Introduction to the Mole

Molar Mass: The mass of one mole of a substance Percent Composition: Identifies the elements present in a compound as a mass % of the total compound mass

41.67% Mg 54.86% O 3.46% H 47.70 % Cr 52.30 % F 15.77% Al 28.11% S 56.12 % O 38.67% K 13.86% N 47.47% O 58.33 grams 108.996 grams 342.14 grams 101.11 grams

How to Convert between Grams and Moles: 1 mol H3PO4 0.306 moles H3PO4 98 g H3PO4

Grams <-> Moles Conversions

Atom vs. Molecule ATOM MOLECULE Atom= the smallest, simplest unit of matter. Can refer to individual elements only Molecule=the smallest, simplest unit of a pure substance Can refer to elements or compounds ATOM H H H H H MOLECULE MOLECULE

ATOM MOLECULE H H H H H MOLECULE A water molecule is represented by H2O A water molecule contains 2 atoms of hydrogen and 1 atom of oxygen A hydrogen molecule is represented by H2 (it’s diatomic) An oxygen molecule is made up of 2 hydrogen atoms

Remember: 1 mole = 6.02 x 1023 particles!

Converting between grams and molecules 1 mol C3H5N3O9 6.02 x 1023 molecules C3H5N3O9 227.09 g C3H5N3O9 1 mol C3H5N3O9 =1.51x 1024 molecules C3H5N3O9

Molecules Conversions 1.51 x 1024 molecules 4.37 x 1023 molecules