Chemistry-Atomic & Molecular Mass
NEET Chemistry Atomic & Molecular Mass MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the average atomic mass of argon given the following isotopic abundances: 36Ar (0.337%), 38Ar (0.063%), and 40Ar (99.600%).
A
39.95 g/mol
B
38.96 g/mol
C
40.00 g/mol
D
39.00 g/mol
Correct Answer
Option A
Detailed Explanation
The average atomic mass is calculated by taking the weighted average of the isotopic masses, considering their natural abundances: (35.96755 * 0.00337) + (37.96272 * 0.00063) + (39.9624 * 0.99600) = 39.95 g/mol.
Found an issue with this question?