Using Carius method, find out the percentage of bromine in the compound if 0.450 g of organic compound gave 0.200 g of AgBr. (Given: molar mass of Ag = 108; molar mass of Br = 80)

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Editor">Editor Staff asked 1 year ago

Using Carius method, find out the percentage of bromine in the compound if 0.450 g of organic compound gave 0.200 g of AgBr. (Given: molar mass of Ag = 108; molar mass of Br = 80)
 
(a) 18%
 
(b) 17%
 
(c) 17.68%
 
(d) 18.91%
 
This question was addressed to me in semester exam.
 
Question is from Organic Chemistry in chapter Organic Chemistry – Basic Principles and Technique of Chemistry – Class 11
Select the correct answer from above options 
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Editor">Editor Staff answered 1 year ago

The correct choice is (d) 18.91%
 
For explanation: The molar mass of AgBr = 108 + 80
 
= 188 g
 
So, 188 g of AgBr contains 80 g of Br.
 
Then, 0.200 g of AgBr contains 80 * 0.200/ 188 = 0.085 g  bromine
 
Therefore, percentage of bromine = 0.085 * 100/ 0.450
 
                                                              = 18.91%
 
Thus, the percentage of bromine (halogen) using Carius method is 18.91%.

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