Lecture 8_091208 - Mole SI definition the number equal to...

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A mole of atoms of any element has a mass (in grams) equal to the atomic mass of the element in amu. (MOLAR MASS) Mole: SI definition: the number equal to the number of carbon atoms in exactly 12 g of pure C-12. Avogadro’s number is 6.022 x 1023 Atomic number Atomic mass
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The Mole:  Allows us to  make comparisons  between substances  that have  different  masses. Molar Mass:  conversion factor between numbers  of moles and mass
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Molecular Masses Atomic Mass =  Σ  Mass of Isotope x Abundance of  Isotope Mass of molecule:   sum of the masses of all atoms  contained in molecule Atomic Mass H 2 O molecule = amu atomO amu atomO atomH amu atomsH 02 . 18 ) 00 . 16 ( 1 ) 008 . 1 ( 2 = +
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What is the formula mass of BaCO 3 FORMULA MASS:  sum of atomic masses of all  atoms in a formula unit of any compound, molecular  or ionic Atomic mass of barium   = 137.34 amu Atomic mass of carbon       
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Lecture 8_091208 - Mole SI definition the number equal to...

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