Problem: Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11 %, and Ga-71. Use the atomic mass of gallium listed in the periodic table to determine the mass of Ga-71.

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FREE Expert Solution

We’re being asked to to determine the mass of Ga-71. We can use the following equation:


Atomic Mass = [mass×f.a.]isotope 1 + [mass×f.a.]isotope 2


where atomic mass = average atomic mass of the element and f.a. = fractional abundance of the isotope. To get f.a., we simply need to divide the given percent abundance by 100.



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Problem Details

Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11 %, and Ga-71. Use the atomic mass of gallium listed in the periodic table to determine the mass of Ga-71.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Isotopes concept. You can view video lessons to learn Isotopes. Or if you need more Isotopes practice, you can also practice Isotopes practice problems.

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Based on our data, we think this problem is relevant for Professor Ochoa's class at GROSSMONT.