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Chemistry
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2 . The empirical formula of the hydrocarbon is
Q. A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of
C
O
2
. The empirical formula of the hydrocarbon is
139
157
NTA Abhyas
NTA Abhyas 2022
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A
C
6
H
5
B
C
3
H
4
C
C
2
H
4
D
C
7
H
8
Solution:
C
x
H
y
+
(
x
+
4
y
)
O
2
→
x
C
O
2
+
2
y
H
2
O
Number of moles of
C
O
2
=
44
3.08
=
0.07
So
x
=
0.07
Number of moles of
H
2
O
=
18
0.72
=
0.04
So
y
=
0.08
x
:
y
=
7
:
8
Therefore, empirical formula of hydrocarbon is
C
7
H
8
.