Chemistry: An Atoms-Focused Approach
Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
Question
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Chapter 3, Problem 3.123QA
Interpretation Introduction

To find:

The transaction energies from different energy levels in the helium ions

Expert Solution & Answer
Check Mark

Answer to Problem 3.123QA

Solution:

a) The statement is true

b) The statement is false

c) The statement is true

d) The statement is true

Explanation of Solution

1) Concept:

We are asked to determine the energy associated with electron transactions.

We need to identify the initial and final energy levels and calculate the transaction energy by using Bohr’s energy formula.

2) Formula:

i. E= -2.178 × 10-18 J ×Z2 1nfinal2-1ninitial2 

ii. λ= hcE

iii. ν= cλ

3) Calculations:

Apply the Rydberg energy formula using Z = 2 for He+ ion, n =3 to n= 1

E= -2.178 × 10-18 J ×Z2 1nfinal2-1ninitial2 

E= -2.178 × 10-18 J ×22 112-132 

E= -7.74 × 10-18 J

a) The transaction energy for n=3 to n= 1 is -7.74 x 10-18 J.

Energy lost from n= 3 to n = 2 is

E= -2.178 × 10-18 J ×22 122-132 

E1= -1.21 × 10-18 J

Energy lost from n= 2 to n = 1 is

E= -2.178 × 10-18 J ×22 112-122 

E2= -6.53 × 10-18 J

Total energy between two step process is

E= E1+ E2

E=-1.21 × 10-18 J+-6.53 × 10-18 J= -7.74 × 10-18 J

So the total energy is same as the energy lost between two step process.

b) We will calculate the wavelength for n =3 to n= 1.

λ= hcE

λ= 6.626×10-34 j.s ×2.998 ×108 m/s7.74 × 10-18 J

λ=2.57 ×10-8 m

Calculate the wavelength for n =3 to n= 2.

λ= 6.626×10-34 j.s ×2.998 ×108 m/s6.53 × 10-18 J

λ=3.04 ×10-8 m

Calculate the wavelength for n =2 to n= 1.

λ= 6.626×10-34 j.s ×2.998 ×108 m/s1.21 × 10-18 J

λ=1.64 ×10-7 m

Total wavelength for two process is

λ=3.04 ×10-8 m+ 1.64 ×10-7 m =1.94 ×10-7 m

The wavelength from n= 3 to n= 1 is not same with sum of two process.

c) The formula of frequency is

ν= cλ

First calculate the frequency for n= 3 to n =1 transaction.

ν= 2.998 ×  108 m/s2.57 ×10-8 m=1.17 × 1016 s-1

Frequency for n= 3 to n =2

ν= 2.998 ×  108 m/s2.57 ×10-8 m=1.83 × 1015 s-1

Frequency for n= 2 to n =1

ν= 2.998 ×  108 m/s2.57 ×10-8 m=9.86 × 1015 s-1

The sum of two transaction frequency is

λ=1.83 × 1015 s-1+ 9.86 × 1015 s-1 =1.17 × 1016 s-1

So sum of frequency for two photons emitted is equals to the frequency emitted for single photon.

d) The wavelength for He+ ion is

λ= hcE

λ= 6.626×10-34 j.s ×2.998 ×108 m/s7.74 × 10-18 J= 2.57 ×10-8 m

The energy and wavelength of H atom are

E= -2.178 × 10-18 J 112-132 = -1.94 × 10-18 J

λ= 6.626×10-34 j.s ×2.998 ×108 m/s1.94 × 10-18 J=1.03 × 10-7 m

The wavelength for He+ ions is shorter than H atom.

Conclusion

We used Bohr’s energy relation for calculation of energy, wavelength and frequency.

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Chapter 3 Solutions

Chemistry: An Atoms-Focused Approach

Ch. 3 - Prob. 3.20QACh. 3 - Prob. 3.21QACh. 3 - Prob. 3.22QACh. 3 - Prob. 3.23QACh. 3 - Prob. 3.24QACh. 3 - Prob. 3.25QACh. 3 - Prob. 3.26QACh. 3 - Prob. 3.27QACh. 3 - Prob. 3.28QACh. 3 - Prob. 3.29QACh. 3 - Prob. 3.30QACh. 3 - Prob. 3.31QACh. 3 - Prob. 3.32QACh. 3 - Prob. 3.33QACh. 3 - Prob. 3.34QACh. 3 - Prob. 3.35QACh. 3 - Prob. 3.36QACh. 3 - Prob. 3.37QACh. 3 - Prob. 3.38QACh. 3 - Prob. 3.39QACh. 3 - Prob. 3.40QACh. 3 - Prob. 3.41QACh. 3 - Prob. 3.42QACh. 3 - Prob. 3.43QACh. 3 - Prob. 3.44QACh. 3 - Prob. 3.45QACh. 3 - Prob. 3.46QACh. 3 - Prob. 3.47QACh. 3 - Prob. 3.48QACh. 3 - Prob. 3.49QACh. 3 - Prob. 3.50QACh. 3 - Prob. 3.51QACh. 3 - Prob. 3.52QACh. 3 - Prob. 3.53QACh. 3 - Prob. 3.54QACh. 3 - Prob. 3.55QACh. 3 - Prob. 3.56QACh. 3 - Prob. 3.58QACh. 3 - Prob. 3.59QACh. 3 - Prob. 3.60QACh. 3 - Prob. 3.61QACh. 3 - Prob. 3.62QACh. 3 - Prob. 3.63QACh. 3 - Prob. 3.64QACh. 3 - Prob. 3.65QACh. 3 - Prob. 3.66QACh. 3 - Prob. 3.67QACh. 3 - Prob. 3.68QACh. 3 - Prob. 3.69QACh. 3 - Prob. 3.70QACh. 3 - Prob. 3.71QACh. 3 - Prob. 3.72QACh. 3 - Prob. 3.73QACh. 3 - Prob. 3.74QACh. 3 - Prob. 3.75QACh. 3 - Prob. 3.76QACh. 3 - Prob. 3.77QACh. 3 - Prob. 3.78QACh. 3 - Prob. 3.79QACh. 3 - Prob. 3.80QACh. 3 - Prob. 3.81QACh. 3 - Prob. 3.82QACh. 3 - Prob. 3.83QACh. 3 - Prob. 3.84QACh. 3 - Prob. 3.85QACh. 3 - Prob. 3.86QACh. 3 - Prob. 3.87QACh. 3 - Prob. 3.88QACh. 3 - Prob. 3.89QACh. 3 - Prob. 3.90QACh. 3 - Prob. 3.91QACh. 3 - Prob. 3.92QACh. 3 - Prob. 3.93QACh. 3 - Prob. 3.94QACh. 3 - Prob. 3.95QACh. 3 - Prob. 3.96QACh. 3 - Prob. 3.97QACh. 3 - Prob. 3.98QACh. 3 - Prob. 3.99QACh. 3 - Prob. 3.100QACh. 3 - Prob. 3.101QACh. 3 - Prob. 3.102QACh. 3 - Prob. 3.103QACh. 3 - Prob. 3.104QACh. 3 - Prob. 3.105QACh. 3 - Prob. 3.106QACh. 3 - Prob. 3.107QACh. 3 - Prob. 3.108QACh. 3 - Prob. 3.109QACh. 3 - Prob. 3.110QACh. 3 - Prob. 3.111QACh. 3 - Prob. 3.112QACh. 3 - Prob. 3.113QACh. 3 - Prob. 3.114QACh. 3 - Prob. 3.115QACh. 3 - Prob. 3.116QACh. 3 - Prob. 3.117QACh. 3 - Prob. 3.118QACh. 3 - Prob. 3.119QACh. 3 - Prob. 3.120QACh. 3 - Prob. 3.121QACh. 3 - Prob. 3.122QACh. 3 - Prob. 3.123QACh. 3 - Prob. 3.124QACh. 3 - Prob. 3.125QACh. 3 - Prob. 3.126QACh. 3 - Prob. 3.127QACh. 3 - Prob. 3.128QACh. 3 - Prob. 3.129QACh. 3 - Prob. 3.130QACh. 3 - Prob. 3.131QACh. 3 - Prob. 3.132QA
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