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Using high-resolution mass spectrometry, an unknown compound produced a (M)+• peak with an m/z = 74.0366.Assuming only C, H, and O atoms may be present, and using the relative atomic masses, propose a formula for the molecule.Select answer from the options belowC3H10OCH4OC3H6O2C6H12O2C7H15OC11H20O3

Question

Using high-resolution mass spectrometry, an unknown compound produced a (M)+• peak with an m/z = 74.0366.Assuming only C, H, and O atoms may be present, and using the relative atomic masses, propose a formula for the molecule.Select answer from the options belowC3H10OCH4OC3H6O2C6H12O2C7H15OC11H20O3

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Solution

To solve this problem, we need to use the high-resolution mass spectrometry data given, which is m/z = 74.0366. This represents the mass-to-charge ratio, but since we're dealing with a (M)+• peak, the charge is +1, so this is essentially the molecular mass of the compound.

We also know that the compound only contains C, H, and O atoms. The relative atomic masses of these elements are approximately 12.01, 1.008, and 16.00 respectively.

We need to find a combination of these elements that adds up to the given molecular mass.

Let's go through the options:

  1. C3H10O: The total mass is 3(12.01) + 10(1.008) + 16.00 = 58.05. This does not match the given mass.

  2. CH4O: The total mass is 12.01 + 4(1.008) + 16.00 = 32.05. This does not match the given mass.

  3. C3H6O2: The total mass is 3(12.01) + 6(1.008) + 2(16.00) = 74.05. This is very close to the given mass, so this could be the correct formula.

  4. C6H12O2: The total mass is 6(12.01) + 12(1.008) + 2(16.00) = 116.10. This does not match the given mass.

  5. C7H15O: The total mass is 7(12.01) + 15(1.008) + 16.00 = 101.15. This does not match the given mass.

  6. C11H20O3: The total mass is 11(12.01) + 20(1.008) + 3(16.00) = 188.23. This does not match the given mass.

So, the correct formula for the molecule is C3H6O2.

This problem has been solved

Similar Questions

Consider the following information from the mass spectrum of an unknown compound.(M)+• at m/z = 72, relative height = 38.3% of base peak(M+1)+• at m/z = 73, relative height = 1.7% of base peakPropose a formula for the molecule:Select answer from the options belowC5H9O2C4H10OC5H9OC4H8OC4H8O2

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A compound has a mass spectrum that shows a 1:1 height ratio of its (M)+• peak at m/z = 136 and its (M+2)+• peak at m/z = 138. Which of the compounds below is consistent with this data?Select answer from the options belowCH3CH2CH2OCH2CH2CH2ClNone of the choices are correct.

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