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Standard X
Chemistry
Industrial Preparation of Ammonia
CaCo3 decompo...
Question
CaCo3 decomposes to give Co2 gas according to the equation CaCo3(s) gives CaO(s)+Co2(g).calculate the mass of CaO(s)produced on complete decomposition of 5.0g of CaCo3.given molar masses of CaO=56g,Co2=44g.
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Solution
Dear Student,
Moles
=
Mass
Molar
mass
Molar
mass
of
CaCO
3
=
Molar
mass
of
CaO
+
Molar
mass
of
CO
2
=
56
+
44
=
100
g
Therefore
,
Moles
of
CaCO
3
=
5
100
=
0
.
05
moles
CaCO
3
(
s
)
→
CaO
(
s
)
+
CO
2
(
g
)
1
mol
of
CaCO
3
gives
1
mol
of
CaO
So
,
0
.
05
mol
of
CaCO
3
will
give
0
.
05
mol
of
CaO
Mass
of
CaO
=
No
.
of
moles
×
molar
mass
=
0
.
05
×
56
=
2
.
8
g
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