
Concept explainers
(a)
Interpretation:
The eigenvalues of total
Concept introduction:
The eigenvalues of the wavefunction that are obtained when an operator is applied are the only possible values of observables. The expression for the eigenvalue is given by,
ˆAΨ=aΨ
The total angular momentum does not depend on the mass of the particle, radius of the rotation and also the magnetic quantum number.

Answer to Problem 11.54E
The eigenvalues of total angular momentum is 12ℏ2.
Explanation of Solution
Explanation:
The general equation for the wavefunction in the 3-dimensional rotation is,
Ψl,ml=1√2π eimϕ⋅θl,ml
The complete form of Ψ3,−2 using Table 11.3 is,
Ψ3,−2=√1054√2πsin2θcosθe−2iϕ
The total angular momentum using the complete forms of operators is,
ˆL2Ψ=−ℏ2(∂2∂θ2+cotθ∂∂θ+1sin2θ∂2∂ϕ2)Ψ
The first derivative of the given wavefunction with respect to θ is,
∂∂θ(√1054√2πsin2θcosθe−2iϕ)
=√1054√2π(2sinθcos2θ−sin3θ)e−2iϕ…(1)
The second derivative of the given wavefunction with respect to θ is,
∂2∂θ2=∂∂θ(√1054√2π(2sinθcos2θ−sin3θ)e−2iϕ)
=√1054√2π(2cos3θ−4sin2θcosθ−3sin2θcosθ)e−2iϕ…(2)
The second derivative of the given wavefunction with respect to ϕ is,
∂2∂ϕ2(√1054√2πsin2θcosθe−2iϕ)=(−2)2i2×√1054√2πsin2θcosθe−2iϕ=−4×√1054√2πsin2θcosθe−2iϕ
=−√105√2πsin2θcosθe−2iϕ…(3)
Substitute equation (1), (2) and (3) in the equation of total angular momentum as shown below.
ˆL2Ψ3,−2=−ℏ2(√1054√2π(2cos3θ−4sin2θcosθ−3sin2θcosθ)e−2iϕ+cotθ√1054√2π(2sinθcos2θ−sin3θ)e−2iϕ−1sin2θ√105√2πsin2θcosθe−2iϕ)
Take common terms together and rearrange the given equation as shown below.
ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ((2cos3θ−7sin2θcosθ)+cotθ(2sinθcos2θ−sin3θ)e−2iϕ−4cosθe−2iϕ)
Substitute the value of cotθ=cosθsinθ in the given equation.
ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ((2cos3θ−7sin2θcosθ)+cosθsinθ(2sinθcos2θ−sin3θ)e−2iϕ−4cosθe−2iϕ)ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ((2cos3θ−7sin2θcosθ)+(2cos3θ−cosθsin2θ)−4cosθ)ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ(4cos3θ−8sin2θcosθ−4cosθ)
Substitute cos2θ=1−sin2θ in the given equation.
ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ(4cosθ(1−sin2θ)−8sin2θcosθ−4cosθ)ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ(4cosθ−4sin2θcosθ−8sin2θcosθ−4cosθ)ˆL2Ψ3,−2=−ℏ2√1054√2πe−2iϕ(−12sin2θcosθ)ˆL2Ψ3,−2=12ℏ2√1054√2πe−2iϕ(sin2θcosθ)
Thus, the total angular momentum is represented as,
ˆL2Ψ3,−2=12ℏ2Ψ3,−2
The eigenvalues of total angular momentum is 12ℏ2.
The eigenvalues of total angular momentum is 12ℏ2.
(b)
Interpretation:
The eigenvalues of z-component of angular momentum is to be evaluated using the complete forms of given wavefunction Ψ3,−2 and operators.
Concept introduction:
The eigenvalues of the wavefunction that are obtained when an operator is applied are the only possible values of observables. The expression for the eigenvalue is given by,
ˆAΨ=aΨ
The z-component of the three dimensional angular momentum that has components in x, y and z direction is quantized.

Answer to Problem 11.54E
Explanation of Solution
The general equation for the wavefunction in the 3-dimensional rotation is,
Ψl,ml=1√2π eimϕ⋅θl,ml
The complete form of Ψ3,−2 using Table 11.3 is,
Ψ3,−2=√1054√2πsin2θcosθe−2iϕ
The z-component of angular momentum using the complete forms of operators is,
ˆLzΨ3,−2=−iℏ∂∂ϕΨ3,−2
The first derivative of the given wavefunction with respect to ϕ is,
∂∂ϕ(√1054√2πsin2θcosθe−2iϕ)
=(−2)i×√1054√2πsin2θcosθe−2iϕ…(4)
Substitute equation (4) in the equation of z-component of angular momentum as shown below.
ˆLzΨ3,−2=−iℏ((−2)i×√1054√2πsin2θcosθe−2iϕ)ˆLzΨ3,−2=−2ℏ(√1054√2πsin2θcosθe−2iϕ)ˆLzΨ3,−2=−2ℏΨ3,−2
The eigenvalues of z-component of angular momentum is −2ℏ.
The eigenvalues of z-component of angular momentum is −2ℏ.
(c)
Interpretation:
The eigenvalue of energy is to be evaluated using the complete forms of given wavefunction Ψ3,−2 and operators.
Concept introduction:
The eigenvalues of the wavefunction that are obtained when an operator is applied are the only possible values of observables. The expression for the eigenvalue is given by,
ˆAΨ=aΨ
The energy of the particle depends on the moment of inertia, quantum number and Planck’s constant. The total energy is quantized.

Answer to Problem 11.54E
The eigenvalue of energy for the given wavefunctionis 6ℏ2I.
Explanation of Solution
The general equation for the wavefunction in the 3-dimensional rotation is,
Ψl,ml=1√2π eimϕ⋅θl,ml
The complete form of Ψ3,−2 using Table 11.3 is,
Ψ3,−2=√1054√2πsin2θcosθe−2iϕ
The eigen equation for the Hamiltonian operator is,
ˆHΨ3,−2=EΨ3,−2
The Hamiltonian operator for energy applied on the given wavefunction is also represented in the form of total angular momentum.
ˆHΨ3,−2=ˆL2Ψ3,−22I
The value of total angular momentum is 12ℏ2.
ˆHΨ3,−2=12ℏ2Ψ3,−22IˆHΨ3,−2=6ℏ2Ψ3,−2I
The eigenvalue of energy E for the given wavefunction is 6ℏ2I.
The eigenvalue of energy E for the given wavefunction is 6ℏ2I.
Want to see more full solutions like this?
Chapter 11 Solutions
Physical Chemistry
- Li+ is a hard acid. With this in mind, which if the following compounds should be most soluble in water? Group of answer choices LiBr LiI LiF LiClarrow_forwardQ4: Write organic product(s) of the following reactions and show the curved-arrow mechanism of the reactions. Br MeOH OSO2CH3 MeOHarrow_forwardProvide the correct IUPAC name for the compound shown here. Reset cis- 5- trans- ☑ 4-6- 2- 1- 3- di iso tert- tri cyclo sec- oct but hept prop hex pent yl yne ene anearrow_forward
- Q6: Predict the major product(s) for the following reactions. Note the mechanism (SN1, SN2, E1 or E2) the reaction proceeds through. If no reaction takes place, indicate why. Pay attention to stereochemistry. NaCN DMF Br σ Ilm... Br H Br H H NaCN CH3OH KOtBu tBuOH NaBr H₂O LDA Et2O (CH3)2CHOH KCN DMSO NaOH H₂O, A LDA LDA Systemarrow_forwardQ7: For the following reactions, indicate the reaction conditions that would provide the indicated product in a high yield. Note the major reaction pathway that would take place (SN1, SN2, E1, or E2) Note: There may be other products that are not shown. There maybe more than one plausible pathway. Br H3C OH H3C CI ... H3C SCH2CH3 CI i SCH2CH3 ཨ་ Br System Settarrow_forwardQ2: Rank the compounds in each of the following groups in order of decreasing rate of solvolysis in aqueous acetone. OSO2CF3 OSO2CH3 OH a. b. CI Brarrow_forward
- ох 4-tert-butyl oxy cyclohex-1-ene Incorrect, 1 attempt remaining The systematic name of this compound classifies the -OR group as a substituent of the hydrocarbon, which is considered the principal functional group. The ether substituent is named with the suffix 'oxy'. The general format for the systematic name of a hydrocarbon is: [prefix/substituent] + [parent] + [functional group suffix] Substituents are listed in alphabetical order. Molecules with a chiral center will indicate the absolute configuration at the beginning of its name with the R and S notation.arrow_forward5. Compressibility (6 points total). The isothermal compressibility is a measure of how hard/easy it is to compress an object (how squishy is it?) at constant temperature. It is др defined as Br=-()=-(200²)T' (a) You might wonder why there is a negative sign in this formula. What does it mean when this quantity is positive and what does it mean when this quantity is negative? (b) Derive the formula for the isothermal compressibility of an ideal gas (it is very simple!) (c) Explain under what conditions for the ideal gas the compressibility is higher or lower, and why that makes sense.arrow_forward19. (3 pts) in Chapter 7 we will see a reaction of halocyclohexanes that requires that the halogen occupy an axial position with this in mind, would you expect cis-1-bromo-3-methylcyclohexane or trans-1-bromo-3-methylcyclohexane to be more reactive in this reaction? Briefly explain your choice using structures to support your answer. Mere-eries-cecleone) The tran-i-browse-3-methylcyclohexionearrow_forward
- Please help me calculate the undiluted samples ppm concentration. My calculations were 280.11 ppm. Please see if I did my math correctly using the following standard curve. Link: https://mnscu-my.sharepoint.com/:x:/g/personal/vi2163ss_go_minnstate_edu/EVSJL_W0qrxMkUjK2J3xMUEBHDu0UM1vPKQ-bc9HTcYXDQ?e=hVuPC4arrow_forwardProvide an IUPAC name for each of the compounds shown. (Specify (E)/(Z) stereochemistry, if relevant, for straight chain alkenes only. Pay attention to commas, dashes, etc.) H₁₂C C(CH3)3 C=C H3C CH3 CH3CH2CH CI CH3 Submit Answer Retry Entire Group 2 more group attempts remaining Previous Nextarrow_forwardArrange the following compounds / ions in increasing nucleophilicity (least to most nucleophilic) CH3NH2 CH3C=C: CH3COO 1 2 3 5 Multiple Choice 1 point 1, 2, 3 2, 1, 3 3, 1, 2 2, 3, 1 The other answers are not correct 0000arrow_forward
- Physical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,Chemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning

