(a) For molecules having small molecular masses, mass spectrometry can be used to identify their formulas. To illustrate this point, identify the molecule that most likely accounts for the observation of a peak in a mass spectrum at 16 amu, 17 amu, 18 amu, and 64 amu.
(b) Note that there are (among others) two likely molecules that would give rise to a peak at 44 amu, namely, $\mathrm{C}_{3} \mathrm{H}_{8}$ and $\mathrm{CO}_{2} .$ In such cases, a chemist might try to look for other peaks generated when some of the molecules break apart in the spectrometer. For example, if a chemist sees a peak at 44 amu and also one at 15 amu, which molecule is producing the 44 -amu peak? Why?
(c) Using the following precise atomic masses $-\mathrm{H}$ ( 1.00797 amu), ${ }^{12} \mathrm{C}(12.00000 \mathrm{amu}),$ and ${ }^{16} \mathrm{O}(15.99491 \mathrm{amu})-$ how precisely must the masses of $\mathrm{C}_{3} \mathrm{H}_{8}$ and $\mathrm{CO}_{2}$, be measured to distinguish between them?