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# Chapter_3__AP_ - 3 Chapter 9 Section 1 Introduction to...

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Copyright © by Holt, Rinehart and Winston. All rights reserved. Resources Chapter menu Chapter 9 Section 1 Introduction to Stoichiometry Stoichiometry Definition Composition stoichiometry deals with the mass relationships of elements in compounds. Reaction stoichiometry involves the mass relationships between reactants and products in a chemical reaction. 3

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Copyright © by Holt, Rinehart and Winston. All rights reserved. Resources Chapter menu Chapter 9 Problem Type 2: Given is an amount in moles and unknown is a mass Amount of given substance (mol) Problem Type 1: Given and unknown quantities are amounts in moles. Amount of given substance (mol) Reaction Stoichiometry Problems Section 1 Introduction to Stoichiometry Amount of unknown substance (mol) Mass of unknown substance (g) Amount of unknown substance (mol) 3
Copyright © by Holt, Rinehart and Winston. All rights reserved. Resources Chapter menu Chapter 9 Problem Type 4: Given is a mass and unknown is a mass. Mass of a given substance (g) Problem Type 3: Given is a mass and unknown is an amount in moles. Mass of given substance (g) Reaction Stoichiometry Problems, continued Section 1 Introduction to Stoichiometry Amount of unknown substance (mol) Amount of given substance (mol) Mass of unknown substance (g) Amount of unknown substance (mol) Amount of given substance (mol) 3

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Copyright © by Holt, Rinehart and Winston. All rights reserved. Resources Chapter menu Chapter 9 Section 2 Atomic Masses Relative Atomic Masses The standard used by scientists to compare units of atomic mass is the carbon-12 atom, which has been arbitrarily assigned a mass of exactly 12 atomic mass units, or 12 amu. One atomic mass unit, or 1 amu, is exactly 1/12 the mass of a carbon-12 atom. The atomic mass of any atom is determined by comparing it with the mass of the carbon-12 atom. 3

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Copyright © by Holt, Rinehart and Winston. All rights reserved. Resources Chapter menu Chapter 9 Section 3 The Mole Relating Mass to Numbers of Atoms The Mole The mole is the SI unit for amount of substance. A mole (abbreviated mol) is the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12. Avogadro’s Number Avogadro’s number —6.022 1415 × 10 23 —is the number of particles in exactly one mole of a pure substance. 3

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Chapter_3__AP_ - 3 Chapter 9 Section 1 Introduction to...

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