Question -IsotopeRelativeAbudance(%)AtomicMass(amu)12C98.8921213C1.10813.0033514C2×10−1014.00317 From the data given in the table, calculate the average atomic mass of C
Options:
A .  13 u
B .  12.011 u
C .  12.001 u
D .  12.0011 u
Answer: Option B : B Average atomic mass is the weighted average of atomic mass of all the isotopes. Contribution by each isotope = (Relative abundance) (Atomic mass) Contribution by 126C = (0.98892)(12)/100 = 11.86704 136C = (0.01108)(13.00335)/100 = 0.14407712 146C = (2 ×10−10)(14.003170/100 = 28.00634×10−12 ∴ Average atomic mass = sum of all contribution = 12.011 u
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