Question

Find to three significant digits the charge and the mass of the following particles. Suggestion: Begin by looking up the mass of a neutral atom on the periodic table of elements in Appendix C of the textbook.

Answer 1

5.

Charge = +1e = 1.6 x 10^-19 C

6.

mass of a single atom = 22.98977 g/mol / 6.022045X10^23

= 3.817602 X 10^-23 g/atom X 1 kg/1000 g

= 3.817602 X 10^-26 kg

Mass of an electron = 9.109 X 10^-31 kg

So, mass of sodium ion = 3.817602 X 10^-26 - 9.109 X 10^-31 = 3.8175 X 10^-26 kg

7.

charge = +2e = 2x1.6x10^-19 C = 3.2x10^-19 C