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Chapter 12.1 Pages 353-358. Stoichiometry Greek for “measuring elements” Pronounced “stoy kee ahm uh tree” Definition: Calculations of the quantities.

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Presentation on theme: "Chapter 12.1 Pages 353-358. Stoichiometry Greek for “measuring elements” Pronounced “stoy kee ahm uh tree” Definition: Calculations of the quantities."— Presentation transcript:

1 Chapter 12.1 Pages

2 Stoichiometry Greek for “measuring elements” Pronounced “stoy kee ahm uh tree” Definition: Calculations of the quantities in chemical reactions, based on a balanced equation.

3 There are 4 ways to interpret a balanced chemical equation Moles Coefficient ratios Particles 6.02 × particles/mole Mass Molar mass/mole Volume 22.4 L/mole

4 Mass and atoms are ALWAYS conserved, however, molecules, formula units, moles, and volumes will not necessarily be conserved

5 Mole to Mole Conversions The coefficients tell us how many moles of each substance 2Al 2 O 3  Al + 3O 2 Molar Ratios Each time we use 2 moles of Al 2 O 3 we also make 3 moles of O 2. 2 moles Al 2 O 3 3 mole O 2 or 2 moles Al 2 O 3 3 mole O 2

6 Mole to Mole Conversions Practice How many moles of O 2 are produced when 3.34 moles of Al 2 O 3 decompose? 2Al 2 O 3  Al + 3O mol Al 2 O 3 2 mol Al 2 O 3 3 mol O 2 = 5.01 mol O 2

7 Mole to Mole Conversions Practice How many moles of H 2 are produced when 2.05 moles of Na react with water? __Na + __H 2 O  __NaOH + __H mol Na 2 mol Na 1 mol H 2 = 1.03 mol H 2


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