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CBSE Class 11-science Answered

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?
Asked by rahmani | 27 Jan, 2011, 12:00: AM
Expert Answer
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
Answered by | 28 Jan, 2011, 10:26: AM
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