CHAPTER 3 SG

CHAPTER 3 SG - CHAPTER 3 STUDY GUIDE What is the definition...

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CHAPTER 3: STUDY GUIDE What is the definition for stoichiometry? Why do chemists count by weight? What is the basis for atomic masses? Define natural abundance and average atomic mass. What are the units for atomic mass? Naturally occurring magnesium has the following isotopic abundances: Isotope Abundance Atomic Mass (amu) 24 Mg 78.99 % 23.98504 25 Mg 10.00 % 24.98584 26 Mg 11.01 % 25.98259 Determine the average atomic mass of Mg. How does this compare to the number listed on the periodic table. What is a mole? What is Avogado’s number? What is molar mass? Calculate the following quantities: mass, in grams, of 0.105 mol sucrose (C 12 H 22 O 11 ) moles of Zn(NO 3 ) 2 in 143.50 g of this substance number of molecules in 1.0 x 10 -6 mol CH 3 CH 2 OH number of H atoms in 0.410 mol NH 3 mass, in grams, of 5.76 x 10 -3 mol CdS number of moles of NH 4 Cl in 112.6 g of this substance number of molecules in1.305 x 10 -2 mol C 6 H 6 number of oxygen atoms in 4.88 x 10 -3 mol of aluminum nitrate What is mass percent composition?
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This note was uploaded on 07/22/2008 for the course CHEM 105A taught by Professor Bau during the Summer '04 term at USC.

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CHAPTER 3 SG - CHAPTER 3 STUDY GUIDE What is the definition...

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