1) The average atomic mass of naturally occurring silicon is 28.0855 amu. Silico

Question

1) The average atomic mass of naturally occurring silicon is 28.0855 amu. Silicon has three naturally occurring isotopes (Si-28,Si-29 and Si-30). The mass and natural abundance of Si-28 are 27.9769 amu and 92.2% respectively. The mass and natural abundance of Si-29 are 28.9765 annul and 4.67%, respectively. Find the mass and natural abundance of Si-30. (See pages 66-67 in Tro 2) a) How many moles of nitrogen do 3.0 x 10^24 nitrogen atoms represent? b) What is the mass in grams for this amount of nitrogen? (See pages 70-72 in Tro) c) Row many total protons exist in 3.0 x 10^24 nitrogen atoms?

Explanation / Answer

1) Natural Abundance

100-( 92.2%+4.67%)= natural abundance of Si-30=3.13%

Mass of Si-30

(27.9769amu*.922)+(28.9765*.0467)+(mass of Si-30*,0313)=28.055

Mass of Si-30=28.98amu

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