Bromine exists as a mixture of two isotopes. For every 1000 atoms of ^79Br, ther

Question

Bromine exists as a mixture of two isotopes. For every 1000 atoms of ^79Br, there are 977 atoms of ^81Br. Chlorine exists as a mixture of two isotopes. For every 1000 atoms of ^35CI, there are 325 atoms of ^37CI. A mass spectrum is run on bromochloromethane. is the molecular ion (M) for bromochloromethane? The mass spectrum for bromochloromethane also shows peaks at M + 2 and at M + 4. If the abundance of M is set to 100, what is the abundance of each of these peaks? Assume that the impact of heavier isotopes of hydrogen and carbon is negligible.

Explanation / Answer

Molecular ion (M) for bromochloromethane = 128

Abndance of each peak would be

With, M = 100

M+2 = 67

M+4 = 11

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