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?

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.
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Team
Topperlearning
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