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JEE Main Chemistry Class 11 Some Basic Concepts of Chemistry Questions
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© examsnet.com
Question : 2
Total: 100
The complete combustion of
0.492
g
of an organic compound containing '
C
', '
H
' and '
O
' gives
0.793
g
of
CO
2
and
0.442
g
of
H
2
O
. The percentage of oxygen composition in the organic compound is_______ (nearest integer)
[28-Jun-2022-Shift-2]
Your Answer:
Validate
Solution:
Total organic compound
=
0.492
gm
Produced
CO
2
=
0.793
gm
∴
Moles of
CO
2
=
0.793
44
∴
Moles of
C
atoms
=
0.793
44
∴
Weight of
C
atoms
=
0.793
44
×
12
=
0.216
g
Produced
H
2
O
=
0.442
gm
∴
Moles of
H
2
O
=
0.442
18
∴
Moles of
H
atoms
=
0.442
18
∴
Weight of
H
atoms
=
0.442
18
×
2
=
0.05
g
∴
Weight of
O
atoms
=
0.492
−
(
0.216
+
0.05
)
=
0.226
gm
%
by mass of oxygen in compound
=
0.226
0.492
×
100
=
46
%
© examsnet.com
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