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Standard XII
Chemistry
Density
how to find a...
Question
how to find atomic weight of cu?
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Q.
Sir how to find avg. Atomic weight of an element.
Q.
8
H
+
+
3
C
u
S
+
8
N
O
3
−
→
3
S
O
4
2
−
+
3
C
u
2
+
+
8
N
O
+
4
H
2
O
(Atomic weights:
C
u
S
=
96
;
N
O
=
30
)
If
200
g
of
C
u
S
are consumed, then approximately how many grams of
N
O
are produced?
Q.
How many grams of copper will be deposited from a solution of
C
u
S
O
4
bypassing 0.5 faradays of electricity?
[Atomic weight of
C
u
=
63.5
g/mole]
Q.
When
Z
n
dust is added to sufficiently large volume of aqueous solution of copper sulphate.
3.175
g of copper metal and
20
J of heat is evolved. The
Δ
H
for the reaction is:
Z
n
(
s
)
+
C
u
S
O
4
(
a
q
)
⟶
Z
n
S
O
4
(
a
q
)
+
C
u
(
s
)
(Atomic weight of
Z
n
=
65.3
, atomic weight of
C
u
=
63.5
)
Q.
1.19
g mixture of Cu, Zn and Al contain
50
% copper by weight and
3
×
10
21
atoms of zinc, find gram atoms of aluminium in given mixture? (Atomic mass of
A
l
=
27
;
C
u
=
63.55
,
Z
n
=
65.0
) [
N
A
=
6
×
10
23
]
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