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Tardigrade
Question
Chemistry
How many atoms are there in 4.25 g of NH3 ?
Q. How many atoms are there in
4.25
g
of
N
H
3
?
1722
218
JIPMER
JIPMER 2012
Some Basic Concepts of Chemistry
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A
6
×
1
0
23
42%
B
1.5
×
1
0
23
30%
C
3.4
×
1
0
23
22%
D
1
×
1
0
23
7%
Solution:
The no. of molecules
=
Molar mass
Given mass
×
N
A
=
17
4
⋅
25
×
6
⋅
022
×
1
0
23
=
1.5055
×
1
0
23
One molecules of
N
H
3
has 4 atom.
Hence no. of atoms
=
1
⋅
5055
×
1
0
23
×
4
=
6
⋅
022
×
1
0
23