The relative atomic mass of the element (accurate to hundredths), based on the molar content of individual nuclides: 7935Br (50.56%); 8235Br (49.44%).
1. We write down the general formula for finding the atomic mass from the known masses of nuclides:
Ar (Br) = ϕ1 * Ar1 (Br) + ϕ2 * Ar2 (Br);
2.we substitute the known data and calculate the relative atomic mass of bromine:
Ar (Br) = 0.5056 * 79.35 + 0.4944 * 82.35 = 80.83.
Answer: Ar (Br) = 80.83.
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