Problem: The element X has three naturally occuring isotopes;  aX, bX, and cX, where a, b, and c represent the mass number. The masses (amu),except aX, and the percent abundances of the isotopes are given in the table below. The average atomic mass of X is 17.20 amu. What is the mass of aX in amu? a. 16.60 b. 16.67 c. 19.01 d. 18.11 e. 9.99

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The element X has three naturally occuring isotopes;  aX, bX, and cX, where a, b, and c represent the mass number. The masses (amu),except aX, and the percent abundances of the isotopes are given in the table below. The average atomic mass of X is 17.20 amu. What is the mass of aX in amu?

a. 16.60

b. 16.67

c. 19.01

d. 18.11

e. 9.99

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