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Chemistry
Efrain Pineda
7 December, 12:15
Calculate average atomic mass: 25% C-11, 25% C-14
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Trevor Joyce
7 December, 13:13
0
6.25 amu
Explanation:
Data Given:
Abundance of C-11 = 25 % = 0.25
mass of carbon-11 = 11 amu
Abundance of C-14 = 25 % = 0.25
mass of carbon-14 = 14 amu
Average atomic mass = ?
Solution:
formula used to check average atomic mass is as under
Average atomic mass = m₁A₁ + m₂A₂
Where
m₁ and m₂ = mass of isotope 1 and 2 respectively
A₁ and A₂ = abundance or fraction of isotope 1 and 2 respectively
Put values in above formula
Average atomic mass = (11 amu) (0.25) + (14 amu) (0.25)
Average atomic mass = 2.75 + 3.5
Average atomic mass = 6.25 amu
So
Average atomic mass of 25% C-11, 25% C-14 = 6.25 amu
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