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Mole, molar mass, Avogadro number and molar volume
NEET level
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Difficulty 1 of 3
mc113
The total number of atoms in 0.5 mol of ammonia,
NH
X
3
, is (take
N
A
=
6.02
×
1
0
23
mo
l
−
1
)
A
3.01
×
1
0
23
B
1.20
×
1
0
24
C
9.03
×
1
0
23
D
2.41
×
1
0
24
Answer: B
One
NH
X
3
molecule has 4 atoms (1 N + 3 H). Atoms = 0.5 x 4 x
N
A
= 2 x 6.02e23 = 1.204e+24. 3.01e+23 is the number of molecules only.
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