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# 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 27th January 2011, 12:00 AM
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 Expert 28th January 2011, 10:26 AM
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