Lecture_06_011812

# Lecture_06_011812 - Lecture 6: Molar Mass and Percent...

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Lecture 6: Molar Mass and Percent Composition • Outline (Ch. 3.1-3.4): ± Atomic Masses and the Mass Spectrometer (3.1) ± The Mole (3.2) ± Molar Mass (3.3) ± Percent Composition of Compounds (3.4) • Problems for Extra Practice: 3.23, 3.25, 3.31, 3.33, 3.35, 3.37, 3.39, 3.41, 3.43, 3.45, 3.47, 3.49, 3.51

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Chapter 3 – Stoichiometry Mole - Mass Relationships in Chemical Systems 3.1 Atomic Masses 3.2 The Mole 3.3 Molar Mass 3.4 Percent Composition of Compounds 3.5 Determining the Formula of a Compound 3.6 Chemical Equations 3.7 Balancing Chemical equations 3.8 Stoichiometric Calculations: Amounts of Reactants and Products 3.9 Calculations Involving a Limiting Reactant
Atomic Definitions Atomic Mass Unit (amu) = 1/12 the mass of a carbon-12 atom; on this scale hydrogen has a mass of 1.008 amu (unified atomic mass unit. ..“u”) Dalton (D) = another name for the atomic mass unit; on this scale 12 C has a mass of 12.00 Daltons;1 Dalton = 1 amu Isotopic Mass = The relative mass of an isotope compared to the 12 C isotope standard = 12.00 amu Atomic Mass or “Atomic Weight” of an element = the average of the masses of its naturally occurring isotopes weighted according to their abundances.

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Gravimetry b weighing and analyzing an element or compound Mass Spectrometry b ionization of elements and deflection of their path by applied magnetic field; RATIO of atomic masses determined; accurate comparison of masses of elements and their isotopes. Methods to Determine Atomic Mass
) Operation of a Mass Spectrometer A B C D E A. Sample vaporized (made into a gas) B. Electron beam removes an electron, forming a positively charged species C. Positive ion accelerated through an electric field D. Magnetic deflection b Lighter ions deflected more than heavier ones. E.

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## This note was uploaded on 01/18/2012 for the course CHEM 142B taught by Professor John during the Winter '11 term at University of Washington.

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Lecture_06_011812 - Lecture 6: Molar Mass and Percent...

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