An unknown element E is found to have two isotopes. The atomic mass of E is 57.15 amu. The mass of the first isotope E - 56 is 56.482 amu, and its natural abundance is 69.19%. Calculate the mass of the second isotope of E?
a. 68.38 amu
b. 54.98 amu
c. 58.65 amu
d. 57.82 amu
e. 56.82 amu
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