# Problem: There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks: Mass (amu)  Relative Size157.8360.2569159.8340.4999161.8320.2431Determine the average molecular mass of a Br2 molecule.

###### FREE Expert Solution

We are asked to determine the average molecular mass of a Br2 molecule.

Mass spectroscopy is an analytical technique that plots ion signal (fractional abundance) as a function of mass-to-charge ratio.

We will solve for each atom’s average mass using their relative size (fractional abundance).

The formula for average mass is:

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###### Problem Details
There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks:

 Mass (amu) Relative Size 157.836 0.2569 159.834 0.4999 161.832 0.2431

Determine the average molecular mass of a Br2 molecule.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Spectrometry concept. If you need more Mass Spectrometry practice, you can also practice Mass Spectrometry practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Dunning's class at TEXAS.