Question
Thu January 27, 2011 By: Azma Rahmani

5. An organic compound contains 26.6%of carbon & 2.2% of hydrogen and the rest oxygen to the vapours density of the compound is 45.Calculate its molecular formula ? Name the organic products obtained when bromo ethen heated with dry silver oxide?

Expert Reply
Fri January 28, 2011
Divide each percent by that element's atomic weight. To get the answers to whole numbers, divide through by the smallest one.
 
C = 26.6/12 = 2.22                                 2.22/2.2 = 1
 
H = 2.2/1 = 2.2                             2.2/2.2 = 1
 
O = 100-(26.6+2.2)= 71.2/ 16 = 4.45     4.45/2.2 = 2.02
 
So, empirical formula is CHO2
 
Vapor density = 45
Molecular weight = 2 x vapor density
MW = 2 x 45 = 90
 
empirical formula is CHO2
weight = 12 + 1+ 32 = 45
since, molecular weight is 90, n= 2
So, molecular formula is C2H2O4
 
 
We hope that clarifies your query.
Regards
Team
Topperlearning
Mon April 17, 2017

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