Ch.19 - Nuclear ChemistryWorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Table Mass Defects and Binding Energies for Three NucleiNucleusMass of Nucleus (amu)Mass of Individual Nucleons (amu)Mass Defect (amu)Binding Energy (J)Binding Energy per Nucleon (J)24 He 4.001504.031

Problem

Table Mass Defects and Binding Energies for Three Nuclei


NucleusMass of Nucleus (amu)Mass of Individual Nucleons (amu)Mass Defect (amu)Binding Energy (J)Binding Energy per Nucleon (J)
24 He 4.001504.031880.030384.53 10-121.13 10-12
2656 Fe55.9206856.449140.528467.90 10-111.41 10-12
92238 U238.00031239.934511.934202.89 10-101.21 10-12


The atomic mass of iron-56 is 55.93494 amu.

Why is this number different from the mass of the nucleus given in the table above?


Solution

We are asked about the difference between the atomic mass and mass of the nucleus of iron-56 (56Fe)


• Recall that the nucleus consists of protons and neutrons. 

• A nucleon is either a proton or neutron. Thus, the mass of individual nucleons is the sum of the masses of protons and neutrons.

Mass of individual nucleons = Mass of protons + Mass of neutrons


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