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week06

# week06 - Ch 4 Chemical Composition Mole Quantities Moles...

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1 Ch 4. Chemical Composition • Mole Quantities • Moles, Masses, and Particles Math Toolbox 1.2 & 1.3 • Determining Empirical and Molecular Formulas • Chemical Composition of Solutions The Mole (counting unit) • Contains 6.022 x 10 23 particles (molecules, atoms, ions, formula units, etc.) – This number is called Avogadro’s number . • The amount of substance that contains as many basic particles as there are atoms in exactly 12 g of 12 C Molar Mass • Describes the mass of 1 mole of a substance • Obtain the Molar Mass from the periodic table by assigning different units to the atomic mass • Molar mass is the conversion factor between mass and moles

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2 Practice - Molar Mass NaCl Molar Mass H 2 O Cl Na O H Atomic or Molecular Mass Element or Compound Percent Mass Composition • An expression of the portion of the total mass contributed by each element • To find the percent composition of an element (E): 100% x sample of mass E of mass E % = Practice – mass% What are the percent iron and the percent sulfur in an 8.33 -g sample of chalcopyrite that contains 2.54 g Fe and 2.91 g S?
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week06 - Ch 4 Chemical Composition Mole Quantities Moles...

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