1) Using data in the table, determine the number of significant figures that must be reported before the difference in mass of 1H
and 1H+ is significant.
Particle Mass (amu)
Proton 1.0073
Electron 5.486×10−4
2)What percentage of the mass of an 1H atom does the electron represent?
Express your answer using four significant figures.
1
Expert's answer
2016-10-08T07:48:04-0400
1) m(1H) = me + mp = 1.0073 + 0.0005(486) = 1.0078 (amu) Thus the difference is 1.0078 - 1.0073 = 0.0005 (amu) or 1 sig. figure.
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