Ch.7 - Quantum MechanicsWorksheetSee 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
Problem

Determine the shortest frequency of light required to remove an electron from a sample of tungsten metal, if the binding energy of tungsten is 3551 kJ/mol. (In other words, 3551 kJ of energy is required to remove one mole of electrons. Hint: first find the energy required to remove a single electron.) 

A) 6.19 × 1016 Hz 

B) 1.27 × 1017 Hz 

C) 4.74 × 1015 Hz 

D) 3.91 × 1017 Hz 

E) 8.90 × 1015 Hz

Solution

We’re being asked to determine the shortest frequency of light required to remove an electron from a sample of tungsten metal. The threshold frequency of the metal is 3551 kJ/mol.


Recall that work function or threshold frequency of the metal is the minimum energy required to remove an electron from the metal.

Therefore, we can calculate the shortest frequency of light required from the threshold frequency or threshold energy.


Given:

ΔE = 3551 kJ/mol

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