Bromine has two naturally occurring isotopes. Bromine-79 has a mass of 78.918 amu and is 50.69% abundant. Using the atomic mass

Question

3 years ago

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reported on the periodic table, determine the mass of bromine-81, the other isotope of bromine.

1 answer:

dsp73 · Answer 1 · 2022-06-04T06:21:39+03:00

Explanation:

Given parameters:

Mass of Br-79 = 78.918 amu

Abundance = 50.69%

Unknown:

Mass of Br - 81 = ?

Solution:

Relative Atomic mass of Br = 80

The proportion by which each fraction of an isotope occurs in nature is called the geonormal abundance.

RAM = Ma Ba + McBc

The formula above is used to find the average mass of the given isotopes.

Since we know the percentage abundance of Br-79, that of Br-81 = 100-50.69= 49.31%

RAM = Ma Ba + McBc

RAM = relative atomic mass

Ma Ba = mass and abundance of Br-79

McBc = mass and abundance of Br-81

80 = (78.918 x $\frac{50.69}{100}$ ) + ( $\frac{49.31}{100}$ x C)

80 = 40 + 0.49C

0.49C = 40

C = $\frac{40}{0.49}$ = 81.63amu

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