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Formula Mass, Molecular Mass, & Percent Composition

Formula Mass, Molecular Mass, & Percent Composition. Formula Mass. The total mass of an ionic compound Sum of the masses of all atoms Remember- subscripts tell how many of each atom is in the compound! Ex: NaCl = (1 x 22.990 amu )+ (1 x 35.453 amu )= 58.443 amu. Molecular Mass.

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Formula Mass, Molecular Mass, & Percent Composition

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  1. Formula Mass, Molecular Mass, & Percent Composition

  2. Formula Mass • The total mass of an ionic compound • Sum of the masses of all atoms • Remember- subscripts tell how many of each atom is in the compound! • Ex: NaCl= (1 x 22.990 amu)+ (1 x 35.453 amu)= 58.443 amu

  3. Molecular Mass • Mass of a molecular compound • Process for calculating molecular mass is the same as for ionic compounds • Ex: H2O= (2 x 1.008 amu) + (1 x 15.999 amu) = 18.015 amu

  4. Practice Determine the mass of the following compounds: CO2 MgCl2 KI BH3

  5. Percent Composition • Percentage by mass of each element in a compound • Mass of element x 100 = % composition of mass of compound element

  6. Example % composition of O in CO2: • CO2 = (1 x 12.01 amu) + (2 x 16.00 amu)= 44.01 amu • 2 O atoms in CO2, which weigh a total of 32.00 amu (16.00 x 2) • 32.00 amu x 100 = 72.71% 44.01 amu

  7. Practice What is the percent composition of H in H2O? What is the percent composition of Li in Li2O?

  8. Chemical Equations and Reactions

  9. What is a chemical reaction? • process by which one or more substances are changed into one or more different substances • Two parts: reactants and products • Described by chemical equations • Provide symbols, identities, and amounts of each substance

  10. Indicators that a reaction occured • Production of heat and/or light • Production of a gas • Formation of a precipitate • Color change

  11. Turn to page 271 in Textbook Complete problems 25,26,27,28, and 29 Due TODAY! TURN IN WITH SUB.

  12. Bell Ringer 10 • Match the equation with the type of reaction. • 1. Na3PO4 + 3 KOH  3 NaOH + K3PO4 • 2. C6H12 + 9 O2 6 CO2 + 6 H2O • 3. CaCO3CaO + CO2 • 4. Pb + FeSO4 PbSO4 + Fe • 5. P4 + 3 O2 2 P2O3

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