Mass Spectrometry

I don't have a clue where to start with this problem: Carbon has two stable isotopes, 12/6C and 13/6C, and fluorine has only one stable isotope, 19/9F. How many peaks would you observe in the mass spectrum of the positive ion of CF4+? Assume that the ion does not break up into smaller fragments.


All 4 of the F's in the molecule would have a mass of 19, and the total for 4 of them would be 19x4 = 76. The mass of the C could be either 12 or 13. Therefore CF4+ could have a mass of either 88 or 89 amu. The charge of CF4+ would be +e. There are only two possible value of the charge/mass ratio, and two mass spectrometer peaks, assuming you have only singly ionized CF4+ and there is no fragmentiation.

  1. 👍 0
  2. 👎 0
  3. 👁 125
asked by Pete

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Sorry for posting this again, I don't know if the question was skipped or not, but I was just wondering if I could get some help on this... thanks. There are 3 known isotopes of Hydrogen and 3 stable isotopes of oxygen. How many

    asked by Jessica on April 21, 2007
  2. Chemistry

    Which element has no stable isotopes? 1. (subscript)27 Co 2. (subscript)51 Sb 3. (subscript)90 Th 4. (subscript)82 Pb I believe it's either 2 or 3, but I can't decide which. I'm not sure how to go about answering this question,

    asked by Anonymous on May 26, 2009
  3. Chem

    There are two stable isotopes of Gallium Their masses are 68.92558 and 70.9247050 AMU. If the average atomic mass of gallium is 69.7231, what is the natural abundance of the lighter isotope? I don't know where to start!

    asked by Emily on September 20, 2012
  4. Math

    I have to find the value of X but I don't where to start I will show the problem below. X 2 - = - 5 400 I have no clue where to start please help! :(

    asked by Conrad on March 30, 2017
  5. chemistry

    there are 3 naturally occurring stable isotopes of oxygen:O-16,O-17, O-18. there are 2 naturally occurring stable isotopes of hydrogen: H-1, H-2.how many different water molecules can be made using the various combination's of all

    asked by Navroz on October 23, 2010
  6. Chemistry

    There are 3 known isotopes of Hydrogen and 3 stable isotopes of oxygen. How many types of water molecules would these produce? Is it 3 ?

    asked by Jessica on April 21, 2007
  7. Physics

    The following table gives values for the mass defect ∆m for four hypothetical nuclei: A, B, C, and D, isotopes of an element. ABCD Mass defect, ∆m(×10^-29 kg) A. B. C. D -6.0 -2.0 0 +6.0 Which statement is true regarding the

    asked by Sidiqi on March 29, 2018
  8. grade 11 chemistry

    12.0 g of carbon reacts with 32.0 g of oxygen to form 44.0 g of Co2. if we react 20.0 g of oxygen with 20.0 g of carbon,how many grams of carbon will be used up?..... i have no clue where to start... can u just tell me the steps

    asked by priya on September 22, 2010
  9. Chemistry 11

    12.0 g of carbon reacts with 32.0 g of oxygen to form 44.0 g of Co2. if we react 20.0 g of oxygen with 20.0 g of carbon,how many grams of carbon will be used up?..... i have no clue where to start... can u just tell me the steps

    asked by priya on September 22, 2010
  10. physics

    i need help understanding physics. im failing my class and don't want to do anything because i have zero clue where to start. im stuck on this problem currently. a cat pushes a ball from a 7.00 m high window, giving it a

    asked by kaleigh on November 2, 2015

More Similar Questions