These exercises are not divided by category, although they are roughly in the order of the topics in the chapter. They are not paired.
It is common in mass spectrometry to assume that the mass of a cation is the same as that of its parent atom.
(a) Using data in Table, determine the number of significant figures that must be reported before the difference in masses of 1H and 1H+ is significant.
Table Comparison of the Proton, Neutron, and Electron
Particle | Charge | Mass (amu) |
Proton | Positive (1+) | 1.0073 |
Neutron | None (neutral) | 1.0087 |
Electron | Negative (1—) | 5.486 × 10-4 |
,
(b) What percentage of the mass of an 1H atom does the electron represent?
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