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Three isotopes exist for potassium. Approximately 93 % of all potassium atoms have a mass of...

Three isotopes exist for potassium. Approximately 93 % of all potassium atoms have a mass of 39 u. 7 % of potassium atoms have a mass of 41 u. A very small proportion of potassium atoms have a mass of 40 u. What is the atomic mass of potassium?

(a) 33.40 u (b) 39.14 u (c) 40.07 u (d) 40.86 u

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