Naturally occurring Gallium consists of 2 isotopes. One of those isotopes is 71Gallium with an isotopic mass of 70.9247050 amu and an abundance of 39.892?%. What is the mass number of the other isotope?
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69.723 = ( 70.9247050 * 39.892/100) + (x * 0.60108)
69.723=( 70.9247050 * 0.39892 ) + 0.60108x
69.723 = 28.29328332 + 0.60108x
69.723 - 28.29328332 = 0.60108x
41.42970668 = 0.60108x
divide both sides by o.60108
The answer is X= 68.9254 amu
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