Chemistry
Average Atomic Mass
Weighted average of isotope masses.
Formula
Formula
Σ (massi · abundancei)
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| massᵢ | isotope masses | computed result | — | result |
| abundanceᵢ | fractional abundances | computed result | — | result |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenisotope masses = 34.969, 36.966, abundances = 0.7577, 0.2423
Result35.4528731
Example 2
Givenisotope masses = 10.013, 11.009, abundances = 0.199, 0.801
Result10.810796