STANDARDChemistry-Atomic Structure
STANDARD Chemistry Isotopes MCQ Question
Type: MCQ-numerical-Medium-Class 11
Two stable isotopes ⁶Li and ⁷Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. The atomic weight of lithium is
A
6.941 u
B
3.321 u
C
2.561 u
D
0.621 u
Correct Answer
Option A
Detailed Explanation
The atomic weight is calculated as the average weight of the isotopes: (6.01512 × 7.5 + 7.01600 × 92.5)/100 = 6.941 u.
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