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How can I solve this problem mathematically. I simply plugged in .05 * 41 and .95* 39 = 39.1, the atomic mass of K This

How can I solve this problem mathematically. I simply plugged in .05 * 41 and .95* 39 = 39.1, the atomic mass of K

This approach would not have worked if I did not have the answer choices available. Is there a mathematical approach to this?

5. Potassium is composed of two naturally-occurring isotopes, potassium- 39 and potassium-41. What is the approximate percent abundance of potassium-41

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