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Gallium has two naturally occurring isotopes. 69Ga (68.9257 amu) is the more abundant isotope, at 60.400%. If the atomic mass of gallium is 69.723 amu, what is the mass of the other isotope, 71Ga

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Answer:

70.9391 amu

Explanation:

The abundance of the second isotope is 100 - 60.4% = 39.6%.

We can solve this problem by keeping in mind the following formula for atomic mass:

  • Atomic mass = Mass of Isotope 1 * Abundance + Mass of Isotope 2 * Abundance

We input the given data:

  • 69.723 = 68.9257 * 60.4/100 + Mass of Isotope 2 * 39.6/100
  • Mass of Isotope 2 = 70.9391 amu

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