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Byju's Answer
Standard X
Chemistry
Mole Concept and Avogadro's Number
The molar mas...
Question
The molar mass of Ne atoms is 20 g/mol. How many moles are there in 100 g of neon?
A
5
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B
0.2
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C
2000
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D
10
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Solution
The correct option is
A
5
N
u
m
b
e
r
o
f
m
o
l
e
s
=
G
i
v
e
n
m
a
s
s
M
o
l
a
r
m
a
s
s
20
g
m
o
f
N
e
=
1
m
o
l
e
N
e
100
g
m
=
1
20
×
100
m
o
l
e
s
=
5
m
o
l
e
s
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0
Similar questions
Q.
If
x
g
of
A
(atomic mass
50
) contains
n
atoms, how many atoms are there in
20
x
g
B
(atomic weight
100
)
Q.
How many
A
g
atoms are there in
0.0001
grams of
A
g
?
Molar mass of
A
g
is
108
grams per mole.
Q.
An atom of neon has a mass of
3.35
×
10
−
23
g
. How many atoms of neon are there in 20 g of the gas?
Q.
Statement 1: A
1.0
g sample of calcium citrate
C
a
3
(
C
6
H
5
O
7
)
2
(molar mass
=
498
g/mol), contains more
C
a
than a
1.0
g sample of calcium carbonate,
C
a
C
O
3
(molar mass
=
100
g/mol)
Statement 2: There are more
C
a
atoms in
1.0
mol of calcium carbonate than in
1.0
mol of calcium citrate.
Q.
Solid phosphorus melts and vapourizes at a high temperature. Gaseous phosphorus effuses at a rate that is 0.57 times that of neon (Ne) in the same apparatus under the same conditions. How many atoms are in a molecule of gaseous phosphorus?
(Ne = 20; P = 31)
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