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Warm-Up: To be turned in

Warm-Up: To be turned in. 1km= ________ mm What is the base unit for temperature?. 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!

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Warm-Up: To be turned in

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  1. Warm-Up: To be turned in • 1km= ________ mm • What is the base unit for temperature?

  2. Formula Mass, Molecular Mass, & Percent Composition

  3. 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

  4. 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

  5. Practice Determine the mass of the following compounds: CO2MgCl2 KI BH3

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

  7. 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

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

  9. Homwwork: due 11/30/2012 • Proof of 3 Trials for Science Fair • Study for quiz (review notes from this week)

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