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Finding exact atomic weight of bromine

 
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Jul26-12, 07:14 AM   #1
 

Finding exact atomic weight of bromine

A sample of carbon tetrabromide CBr4 contains 96.38% bromine and 3.62% carbon by weight, using the atomic weight of C as 12amu, find the exact atomic weight of bromine
 
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Jul26-12, 11:29 AM   #2
 
This is a math problem.

Let "x" represent the total weight.

Let "y" represent the weight of four bromine atoms.

0.0362 * x = 12

0.9638 * x = y

y = 4*(bromine atomic weight)

Solve for the atomic weight of bromine.
 
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