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Standard XII
Chemistry
Introduction to Alkaline Earth Metals
Number of ato...
Question
Number of atoms of iron present in 100 g of Fe2O3 having 20% purity is
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Q.
One of the reactions that occurs in a blast furnace, where iron ore is converted to cast iron is as follows:
F
e
2
O
3
+
3
C
O
⟶
2
F
e
+
3
C
O
2
Suppose that
1.64
×
10
3
kg of Fe are obtained from
2.62
×
10
3
kg sample
F
e
2
O
3
. Assuming that the reaction goes to completion, what is the percent purity of
F
e
2
O
3
in the original sample (rounded to the nearest integer)?
Q.
8.33
×
10
x
carbon atoms are present in a diamond weighing
200
mg and of
20
carat purity. Then, the value of
x
is
_______. write the value in the form of x/3.
Q.
Number of iron atoms present in haemoglobin molecule is
Q.
Percentage purity of a sample of gold is
85
%
. How many atoms of gold are present in its
1
gram sample? (Atomic mass of gold
=
197
u).
Q.
The number of iron (Fe) atoms present in a pure sample of solid iron with a mass of 10 grams is equal to- (The atomic mass of iron is 55.9)
.
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