1.) The average atomic mass of naturallyoccuring neon is 20.18 amu. There are 2

Question

   1.) The average atomic mass of naturallyoccuring neon is 20.18 amu. There are 2 common isotopes ofnaturally occuring neon as indicated below.    Isotope:        Ne-20      Ne-22    Mass Amu:   19.99      21.99 A.) Using the information above, calculate the percentabundance of each isotope. B.) Calculate the number of Ne-22 atoms in a 12.55 g sample ofnaturally occuring neon.    1.) The average atomic mass of naturallyoccuring neon is 20.18 amu. There are 2 common isotopes ofnaturally occuring neon as indicated below.    Isotope:        Ne-20      Ne-22    Mass Amu:   19.99      21.99 A.) Using the information above, calculate the percentabundance of each isotope. B.) Calculate the number of Ne-22 atoms in a 12.55 g sample ofnaturally occuring neon.

Explanation / Answer

20.18=21.99 x X + 19.99 x (1-X) 20.18=21.99X + 19.99 - 19.99X 20.18=X + 19.99 0.19=2X X=0.095 a. 9.5% of Ne-22 1-0.095=90.5% of Ne-20 b. 12.55g    x   mol    x    6.022 x 1023 atomsNe x     9.5 Ne-22=3.58 x1022 atoms of Ne-22      1          20.18g            mol                                   100Ne Good Luck

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