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JEE Main Chemistry Class 11 Organic Chemistry Some Basic Principles and Techniques 1 Questions
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© examsnet.com
Question : 5
Total: 100
The number of moles of
CuO
, that will be utilised in Dumas method for estimation nitrogen in a sample of
57.5
g
ofN, N- dimethylaminopentane is
.
.
.
.
.
.
.
.
.
.
.
.
×
10
−
2
.
(Nearest integer)
[27 Aug 2021 Shift 1]
Your Answer:
Validate
Solution:
In Dumas method,
C
x
H
y
N
z
+
(
2
x
+
y
2
)
CuO
→
x
CO
2
+
y
2
H
2
O
+
z
2
+
(
2
x
+
y
2
)
Cu
N
,
N
-dimethylaminopentane has formula
C
7
H
17
N
.
So, relating with
C
x
H
y
N
z
x = 7
y = 17
z = 1
Molar mass of
C
7
H
17
N
=
115
g
= 22.5 moles of CuO
57.5
g
i.e.
(
57.5
115
)
C
7
H
17
N
will utilise
=
22.5
115
×
57.5
moles of
CuO
=
11.25
g
mol
≈
1125
×
10
−
2
mol
© examsnet.com
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