Question
Chlorine has two isotopes Cl ^ 37 and Cl ^ 35 with percentage abundance of 25\% and 75\% respectively. Find average atomic mass of chlorine ?
MHT CET
Chemistry
Some Basic Concepts of Chemistry
2026
MHT CET 2026 (19 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 35
- B. 37
- C. 35.5
- D. 36
Answer
C. 35.5
Step-by-step solution
Average atomic mass is calculated using the formula: Average atomic mass = ( Isotopic mass Percentage abundance ) 100 Substituting the given values: Average atomic mass = 37 25 + 35 75 100 Average atomic mass = 925 + 2625 100 Average atomic mass = 3550 100 = 35.5 Answer: 35.5
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