May 12, 2024, 08:19:08 PM
Forum Rules: Read This Before Posting


Topic: Can anyone help with find these answers?  (Read 3620 times)

0 Members and 1 Guest are viewing this topic.

Offline doyouknowit

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +0/-1
Can anyone help with find these answers?
« on: December 04, 2007, 10:18:28 PM »
If anyone can help me with these it would be greatly appreciated (only if there right though ;D)

1.) Which of the following represents a possible set of quantum numbers for an electron in an atom? 
a   n =3, l = 0, ml =1, ms =1/2   
b   n =3, l = 0, ml = 0, ms = -1/2 
c   n =3, l = 0, ml = 1, ms = -1/2 
 


2.) Calculate the energy per photon of infrared radiation of frequency 3.00 x 1014 Hz. Planck's constant is 6.63 x 10-34 J*s. 
a   1.99 x 10-19 J 
b   5.97 x 10-11 J   
c   2.21 x 10-48 J 
 
   
3.) Calculate the frequency of a photon emitted by a hydrogen atom when an electron makes a transition from the state with n = 6 to n = 2. Rh = 2.179 x 10-18 J. 
a   2.99 x 103/s 
b   7.30 x 1014/s 
c   1.83 x 108/s 
   
     
4.)  Calculate the energy per MOLE of photons of radio wave frequency 94.1 MHz.   
a   1.42 x 1041 J 
b   0.0376 J 
c   6.24 x 10-26 J 
 
   
5.)  Calculate the wavelength of radio waves corresponding to the FM station with frequency 94.1 MHz (1Hz = 1/s). 
a   2112 nm 
b   3.19 m 
c   3137 nm 
 
 
6.)  An electron in an excited hydrogen atom has the quantum numbers, n = 4, l = 2, ml = 0. In what type of orbital is the electron located? 
a   4s 
b   4d 
c   3d 
 
   
7.)  An electron in an atom has a magnetic quantum number of -3. What is the lowest possible value for the principle quantum number of this electron? 
a   4 
b   3 
c   5 
   
 


Offline Yggdrasil

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3215
  • Mole Snacks: +485/-21
  • Gender: Male
  • Physical Biochemist
Re: Can anyone help with find these answers?
« Reply #1 on: December 05, 2007, 01:34:03 AM »
Please read the Forum Rules.  You should that show you've at least attempted to answer the problem before we will help you.  Many of these are just a matter of looking up formulas from your chemistry text book.

Offline doyouknowit

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +0/-1
Re: Can anyone help with find these answers?
« Reply #2 on: December 05, 2007, 01:52:40 AM »
I have read the rules from the link you provided and I sincerely apologize for breaking any of them.  I would be so happy if someone would help me with any of the questions I have to answer. I'm desperate at this point being that I'am border line pass or fail for my class. With the help of these few question it would mean the world to me.

I beg of your forgiveness and help.

Offline Sev

  • Full Member
  • ****
  • Posts: 231
  • Mole Snacks: +43/-6
  • Gender: Male
Re: Can anyone help with find these answers?
« Reply #3 on: December 05, 2007, 02:12:13 AM »
Quote
1.) Which of the following represents a possible set of quantum numbers for an electron in an atom? 
a   n =3, l = 0, ml =1, ms =1/2  
b   n =3, l = 0, ml = 0, ms = -1/2 
c   n =3, l = 0, ml = 1, ms = -1/2 

b. (ml=0 if l=0)

As Ygg said, most are just formulas (E=hf = hc/lambda, Rydberg eqn etc)


Sponsored Links