Part A Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78.99%, 10.00%, and 11.01%, respectively. Calculate the atomic mass of magnesium. Express the atomic mass in atomic mass units to two decimal places. ΑΣφ ? atomic mass = amu Request Answer Submit Part B 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 from the periodic table to find the mass of Ga-71. Express the mass in atomic mass units to two decimal places. ν ΑΣφ ? mass = amu

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