Answer :
Final answer:
The average atomic mass of chlorine, considering its naturally occurring isotopes chlorine-35 and chlorine-37, is calculated to be 35.5 atomic mass units (option b). This is calculated by multiplying the atomic mass of each isotope by its relative abundance, and summing the results.
Explanation:
The subject is the calculation of the average atomic mass of chlorine, which consists of two isotopes: chlorine-35 and chlorine-37. In nature, these isotopes exist in certain percentages: 75% for chlorine-35 and 25% for chlorine-37.
To calculate the average atomic mass, you have to consider these percentages as their relative abundances, meaning we multiply the atomic mass of each isotope by its relative abundance and then sum the results.
For Chlorine, this results in the following calculation: (75/100 * 35) + (25/100 * 37) = 26.25 + 9.25 = 35.5 g/mol. Therefore, the average atomic mass of chlorine is 35.5 amu (option b).
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