Question

What is the average atomic mass when the isotopes are: 20% 112In, 50% 114In, 25% 116In and 5% 117In?

Answer 1

114.3 AMU.

Explanation: (112 Amu * .20) + (114 amu + .50) + 116 amu*.25) + 117 amu * 0.05)
22.4 + 57 + 29 + 5.85
79.4 + 34.85
114.3 amu