Ch.8 - Periodic Properties of the ElementsWorksheetSee all chapters
All Chapters
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: Calculate the energy change for the reactionK(g) + Br(g) → K+(g) + Br– (g)given the following ionization energy (IE) and electron affinity (EA) valuesIE                                     EAK:   419

Solution: Calculate the energy change for the reactionK(g) + Br(g) → K+(g) + Br– (g)given the following ionization energy (IE) and electron affinity (EA) valuesIE                                     EAK:   419

Problem

Calculate the energy change for the reaction

K(g) + Br(g) → K+(g) + Br (g)

given the following ionization energy (IE) and electron affinity (EA) values

IE                                     EA

K:   419 kJ/mol               48 kJ/mol

Br: 1140 kJ/mol              324 kJ/mol


A)     –1,092 kJ/mol                     D)      1,092 kJ/mo

B)     –95 kJ/mol                          E)      95 kJ/mol

C)      1,187 kJ/mol

 

Solution

We’re being asked to calculate the energy change (ΔE) for the given reaction given their respective ionization energies and electron affinities. 


To calculate for the change in energy, we're going to use the following equation:

E=Ionization Energy (IE)+Electron Affinity (EA)

Recall:

Ionization energy is the energy required to remove an electron from a gaseous atom or ion.

Electron affinity is the energy required to add 1 mole of electrons to a gaseous element. 


                 IE                                EA

K:        419 kJ/mol                 48 kJ/mol

Br:      1140 kJ/mol               324 kJ/mol

View the complete written solution...