Consider the mass spectrum of hexane. a. Label the [M]+ peak. What is the value...

Consider the mass spectrum of hexane.

a. Label the [M]+ peak. What is the value of m/z associated with this peak?

b. What is the mass of a hexane molecule that contains six 12C atoms (¹²CH₃-¹²CH₂-¹²CH₂-¹²CH₂-¹²CH₂-¹²CH₃)?

Does this fit with the m/z value reported in part a of this question?

c. Draw a picture, like the one of “all ¹²C hexane” above, of a molecule that can account for the existence of a peak at m/z = 87 in the mass spectrum of hexane.

d. (Check your work.) There are actually three acceptable answers to the previous question because there are three unique locations in a hexane molecule to replace a 12C with a 13C. If you have not already done so, draw the other two acceptable answers to the previous question.

e. The peak at m/z = 87 is called the [M+1]⁺ peak. Construct an explanation for this name.

f. Use your periodic table to calculate the weight, in grams, of 1 mole of hexane to four significant figures (XX.XX).

g. Explain why 1 mole of hexane