molecular mass. mass of atom measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g defined by...

Molecular Mass

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Molecular Mass

Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10-24 g Defined by assigning the mass of 12 amu

to the carbon-12 isotope

Average Atomic Mass This is what is shown on periodic table Average of all naturally occurring isotopes Can determine by using the masses of the

various isotopes and their relative abundances

Average atomic mass is also called atomic weight

Page 4: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Example Carbon consists of three isotopes. The 1st

has a mass of 12 amu and makes up 98.892%. The 2nd,13.00335 amu and is 1.108%. The 3rd is 14.00317 amu and is 1 x10-10%. What is the average atomic mass?

Page 5: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Molar Mass

The generic term for the mass of one mole. The same as gram molecular mass, gram

formula mass, and gram atomic mass.

Page 6: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Examples

Calculate the molar mass of the following and tell me what type it is.

Na2S

N2O4

Ca(NO3)2

C6H12O6

(NH4)3PO4

Page 7: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Percent Composition Percentage of each element in a compound

by mass Calculate the percentage of each element in

sucrose (C6H12O6).

Page 8: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Mass Spectrometer Instrument used for determining weights of

elements or compounds Gas sample is bombarded with high energy

electrons Collisions between molecules and electrons

produce + ions Ions are focused into a beam by passing

between two slits

Page 9: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Beam then passes between the poles of a magnet which curves the path of the beam

Ones with greater mass curve more

Page 10: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Page 11: Molecular Mass. Mass of Atom Measured in atomic mass unit (amu) 1 amu = 1.66 x 10 -24 g Defined by assigning the mass of 12 amu to the carbon-12 isotope

Separation By changing the

strength of the magnetic field, you can adjust for different mass ions to reach the detector

At the detector a graph of intensity signal is produced

Mole Relationships. By definition: 1 atom 12 C “weighs” 12 amu Atomic mass is the mass of an atom in atomic mass units (amu) The mole (mol) is the amount

Atomic mass is the mass of an atom in atomic mass units (amu)

The S-word Stoichiometry Chapter 3. By definition: 1 atom 12 C “weighs” 12 amu On this scale 1 H = 1.008 amu 16 O = 16.00 amu Atomic mass is the mass

Difference between the mass of an atom and the mass of its individual particles. 4.00260 amu4.03298 amu Mass Defect Nuclear Forces

Versão 1.66

Molar Mass. Molecular Mass The molecular mass of a substance is the mass in atomic mass units (amu) of all the atoms in a given molecule. It is more commonly

Is Phosphine in the Mass Spectra from Venus’ Clouds? · 2020. 9. 29. · o Masses of 29.997 and 15.995 amu are consistent with NO (29.998074 amu) and atomic oxygen (15.995000 amu);

Welcome to our CHEM 4 lecture Go to LearningCatalytics ......5) Calculate the formula mass of lithium perbromate. A) 150.841 amu D) 151 amu B) 150.84 amu E) 150 amu C) 150.8 amu F)

I. Subatomic Particles (p.113 - 114). ParticleSymbolLocationChargeRelative Mass (amu) Actual Mass (g) electron proton neutron e-e- p+p+ n0n0 Electron

Chapter 1Chapter 1 - MIT OpenCourseWare mass defect and binding energy fifor uranium-235 Mass of neutron 1 008665 amuMass of neutron 1.008665 amu Mass of proton 1.007826 amu

Chapter 3 Chemical Stoichiometry. 3.1: Atomic Mass/Weight The average mass of a sulfur atom is 32.06 amu The average mass of a sodium atom is 22.99 amu

CHEMICAL COMPOUNDS AND THE MOLE Chapter 7. Formula Mass Mass of H 2 O? H 2(1.01) + O 16.00_ 18.02 amu Formula Mass: mass of molecule, formula unit,

Lesson What Is the Structure of an Atom? 1...Name of Particle Mass (amu = Atomic Mass Unit) Charge Location Electron 0.000548597 amu or 1.1 10 31 kg negative cloud around nucleus Neutron

Chemistry Is My Jam · carbon-12. So an amu is an atomic mass unit and the proton and the neutron have a mass of roughly 1 amu. They are roughly the same size in terms of mass. The

The Mole Chemistry 6.0 Getting to know the terms…MICROSCOPICMassMACROSCOPIC Molar Mass Atom Atomic mass amu Element g/mol Molecule Molecular mass amu

H atomic mass 1.00795 4x4.03180 amu He 4.00260 amu 0.0292 amu

ATOMIC STRUCTURE. ATOMIC MASS UNIT (a.m.u.) A system of mass measurement used for extremely tiny particles (such as the parts of an atom) 1 a.m.u. = 1.66

Cambridge International Examinations Cambridge ... and A Level/Physics...unified atomic mass unit 1 u = 1.66 × 10–27 kg rest mass of electron m e = 9.11 × 10 –31 kg rest mass

Chapter 8.4. Reminder: 1 mole of a substance = the mass of the substance Example: sodium chloride Na = 23.0 amu 1 mole = 23.0 grams Cl = 35.5 amu

Chapter 3 Stoichiometry. Atomic Mass Carbon-12 is assigned a mass of exactly 12.00 atomic mass units (amu) Masses of other elements are compared to Carbon-12

Mass Relationships in Chemical Reactions. By definition: 1 atom 12 C “weighs” ________ On this scale 1 H = ________ amu 16 O = ________ amu _________________

Chapter 5 -A - Philadelphia University · 2019-03-14 · 3 DALTON (ATOMIC MASS UNIT, AMU) • Atomic and molecular weights are generally expressed in terms of atomic mass units (amu),or

Amu l Mot to Reconsider Full for Mass Publishing 6-20-14

Homework from page 104. 15. Boron has two isotopes. boron-10 mass = 10.013 amu abundance = 19.8% Boron-11 mass = 11.009 amu abundance = 80.2% Calculate

ucfsarc.files.wordpress.com · Web viewGallium has two naturally occurring isotopes: Ga-69, with mass 68.9256 amu and a natural abundance of 60.11%, and Ga-71, with mass 70.9247 amu

Temperature and Kinetic Theory. Atomic Theory Atom – smallest piece of mater Atomic Mass unit – atomic mass unit – amu 1amu = 1.66 x 10 -27 kg

UNIVERSITY OF CAMBRIDGE INTERNATIONAL ... Levels/Physics (9702)/9702...unified atomic mass constant, u = 1.66 × 10–27 kg rest mass of electron, m e = 9.11 × 10 –31 kg rest mass

· The isotope with mass 62.93 amu must be more abundant because its mass is closer to 63.55 amu (the relative weighted average atomic mass for copper) than is the mass of the other

CHAPTER 3B Stoichiometry. Counting Atoms Amu – atomic mass unit 1 amu = 1.66 x 10 -24 g Ex. 1 carbon atom = 12 amu 1 Fe atom = 55.85 amu 1 Na atom = ???

CENTRE FOR DISTANCE EDUCATION, AMU, ALIGARH · 2020-03-03 · CENTRE FOR DISTANCE EDUCATION AMU, ALIGARH D. No. 1056/ CDE Dated: 29.02.2020 Post Graduate Diploma in Journalism & Mass

UNIVERSITY OF CAMBRIDGE INTERNATIONAL …theallpapers.com/papers/CIE/AS_and_ALevel/Physics (9702)/9702_s12... · unified atomic mass constant, u = 1.66 × 10–27 kg rest mass of

Chapter 3. Atomic Mass amu = Average Atomic Mass Unit Based on 12 C as the standard. 12 C = exactly 12 amu The average atomic mass (weight) of

Atoms and Elements - SCITECH-EXPERT.COM · Example 2.5 If copper is 69.17% Cu-63 with a mass of 62.9396 amu and the rest Cu-65 with a mass of 64.9278 amu, ... 0.3083 64.9278 amu Atomic

Anatomy of an Atom Parts of an Atom Nucleus (positive, mass of 1 amu) Neutron (, mass of 1 amu) Electron Cloud Electrons (, negligible mass)