NEET Chemistry Atomic & Molecular Mass MCQ Question
What is the molar mass of argon if its isotopic abundances are 0.337% for 36Ar, 0.063% for 38Ar, and 99.600% for 40Ar?
39.95 g/mol
40.00 g/mol
39.96 g/mol
39.90 g/mol
Correct Answer
Detailed Explanation
The molar mass is calculated by multiplying each isotope's mass by its abundance and summing these products: (35.96755 * 0.00337) + (37.96272 * 0.00063) + (39.9624 * 0.99600) = 39.96 g/mol.
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