cm8 - Chapter 12 Stoichiometry Greek for measuring elements...

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Unformatted text preview: Chapter 12 Stoichiometry Greek for measuring elements The calculations of quantities in chemical reactions based on a balanced equation. We can interpret balanced chemical equations several ways. In terms of Particles Atom - Element Molecule Molecular compound (non- metals) or diatomic (O 2 etc.) Formula unit Ionic Compounds (Metal and non-metal) 2H 2 + O 2 2H 2 O Two molecules of hydrogen and one molecule of oxygen form two molecules of water. 2 Al 2 O 3 4 Al + 3O 2 2 formula units Al 2 O 3 form 4 atoms Al and 3 molecules O 2 2Na + 2H 2 O 2NaOH + H 2 2 atoms Na form 2 formula units NaOH and 1 molecule H 2 and 2 molecules H 2 O Look at it differently 2H 2 + O 2 2H 2 O 2 dozen molecules of hydrogen and 1 dozen molecules of oxygen form 2 dozen molecules of water. 2 x (6.02 x 10 23 ) molecules of hydrogen and 1 x (6.02 x 10 23 ) molecules of oxygen form 2 x (6.02 x 10 23 ) molecules of water. 2 moles of hydrogen and 1 mole of oxygen In terms of Moles 2 Al 2 O 3 4 Al + 3O 2 The coefficients tell us how many moles of each kind 36.04 g reactants 36.04 g reactants In terms of mass The law of conservation of mass applies We can check using moles 2H 2 + O 2 2H 2 O 2 moles H 2 2.02 g H 2 1 moles H 2 = 4.04 g H 2 1 moles O 2 32.00 g O 2 1 moles O 2 = 32.00 g O 2 In terms of mass 2H 2 + O 2 2H 2 O 2 moles H 2 O 18.02 g H 2 O 1 mole H 2 O = 36.04 g H 2 O 2H 2 + O 2 2H 2 O 36.04 g (H 2 + O 2 ) = 36.04 g H 2 O Mole to mole conversions 2 Al 2 O 3 4 Al + 3O 2 every time we use 2 moles of Al 2 O 3 we 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 Mole to Mole conversions How many moles of O 2 are produced when 3.34 moles of Al 2 O 3 decompose? 2 Al 2 O 3 4 Al + 3O 2 3.34 moles Al 2 O 3 2 moles Al 2 O 3 3 mole O 2 = 5.01 moles O 2 Practice 2C 2 H 2 + 5 O 2 4CO 2 + 2 H 2 O If 3.84 moles of C 2 H 2 are burned, how many moles of O 2 are needed? Practice 2C 2 H 2 + 5 O 2 4CO 2 + 2 H 2 O How many moles of C 2 H 2 are needed to produce 8.95 mole of H 2 O? Mass in Chemical Reactions How much do you make? How much do you need? We cant measure moles!! What can we do? We can convert grams to moles. Periodic Table Then use moles to change chemicals Balanced equation Then turn the moles back to grams. Periodic table Periodic Table Moles A Moles B Mass g B Periodic Table Balanced Equation Mass g A Decide where to start based on the units you are given and stop based on what unit you are asked for Conversions 2C 2 H 2 + 5 O 2 4CO 2 + 2 H 2 O How many moles of C 2 H 2 are needed to produce 8.95 g of H 2 O? Conversions 2C 2 H 2 + 5 O 2 4CO 2 + 2 H 2 O If 2.47 moles of C 2 H 2 are burned, how many g of CO 2 are formed? For example. .....
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cm8 - Chapter 12 Stoichiometry Greek for measuring elements...

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