Calculate the atomic mass of neon (Ne) which is composed of three naturally occu

Question

Calculate the atomic mass of neon (Ne) which is composed of three naturally occurring isotopes with the following natural abundances and masses:

a) 90.51% Ne - 20 (mass = 19.992 amu) b) 0.27% Ne - 21 (mass = 20.993 amu)    c) 9.22% Ne - 22 (mass = 21.991 amu)     Show your work.

8. Essay (1 points) 1.0000000000 Moles

How many moles of carbon are there in a diamond weighing 2.11 grams?     Show your work.

9. Essay (1 points) 1.0000000000 Isotopes

Determine the number of protons, neutrons and electrons in each of the following:

                                                      Protons                                    Neutrons              Electrons

a) 23Na+

b) 81Br-

c) 16O2-

10. Essay (1 points) 1.0000000000 Electron Configurations

How many valence electrons are in each of the following elements?

B

Si

Ca

F

Ar

Explanation / Answer

a) atomic mass = (90.51*19.922 + 0.27 * 20.993 + 9.22*21.991 ) / 100
so.. atomic mass = 20.1156535 amu


8 molar mass of carbon = 12 grams ..

as diamond is composed entirely of carbon atom..

so number of moles = 2.11/12 = 0.175833 moles


9)

Na+ : protons 11   neutrons 12 electrons 10

Br : protons 35   neutrons 46 electrons 36

O2 - : protons 8 neutons 8   electron 10


10)

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