2. Atoms & Elements
Atomic Mass
9PRACTICE PROBLEM
Magnesium has three naturally occurring isotopes: 78.99% Mg-24 (mass = 23.9850 amu), 10.00% Mg-25 (mass = 24.9858 amu), and 11.01% Mg-26 (mass = 25.9826 amu). On the other hand, bromine has two isotopes: 50.69% Br-79 (mass = 78.9183 amu) and 49.31% Br-81 (mass = 80.9163 amu). One magnesium combines with two bromine to form the ionic compound magnesium bromide (MgBr2). Give the number of MgBr2 compounds of different masses that can exist and determine the masses of the three most abundant forms of MgBr2.
Magnesium has three naturally occurring isotopes: 78.99% Mg-24 (mass = 23.9850 amu), 10.00% Mg-25 (mass = 24.9858 amu), and 11.01% Mg-26 (mass = 25.9826 amu). On the other hand, bromine has two isotopes: 50.69% Br-79 (mass = 78.9183 amu) and 49.31% Br-81 (mass = 80.9163 amu). One magnesium combines with two bromine to form the ionic compound magnesium bromide (MgBr2). Give the number of MgBr2 compounds of different masses that can exist and determine the masses of the three most abundant forms of MgBr2.