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JEE Main 1-Sep-2021 Shift 2 Solved Paper
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© examsnet.com
Question : 55
Total: 90
The number of atoms in
8
g
of sodium is
x
×
10
23
. The value of x is ......... . (Nearest integer) [Given :
N
A
=
6.02
×
10
23
mol
−
1
Atomic mass of
Na
=
23.0
u
]
[1 Sep 2021 Shift 2]
Your Answer:
Validate
Solution:
Given, mass of Na = 8g
Molar mass of
Na
=
23
gmol
−
1
Weight
of
sodium
atom
Molecular
mass
of
sodium
atom
=
Number
of
atoms
Avogadro
′
s
number
8
g
23
g
=
Number
of
atoms
6.022
×
10
23
Number of atoms
=
8
×
6.022
23
×
10
23
Number of atoms
=
2.09
×
10
23
x ≈ 2
Hence, answer is 2.
© examsnet.com
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