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27.08.2019 •
Physics
Out of 200 neon atoms, 170 will be neon-20(19.992 amu) and 30 will be neon-22(21.991 amu). what is the average atomic mass of neon?
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Ответ:
average atomic mass = 20.29185 amu
Explanation:
given data
neon atom = 200
170 atom = 20(19.992 amu)
30 atom = 22(21.991 amu)
to find out
average atomic mass
solution
we know that average atomic mass formula that is
average atomic mass = Σabundance(%) × exact mass 1
here we know that neon two major isotopes is Neon 20 , Neon 22
abundance 1 = 170 / 200
abundance 2 = 30 /200
exact mass 1 = 19.992 amu
exact mass 2 = 21.991 amu
so
average atomic mass = 170/200 × 19.992 + 30/200 × 21.991
average atomic mass = 20.29185 amu
Ответ:
Explanation:
It depends because the higher the object is, the bigger the shadow, however, the object should be close to the line directly from the sun, for you to see the shadow visible.