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Standard IX
Chemistry
Molecular Mass
Calculate the...
Question
Calculate the formula unit mass (u) of
N
a
2
O
.
A
t
o
m
i
c
m
a
s
s
o
f
N
a
=
23
u
,
O
=
16
u
A
60
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B
62
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C
61
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D
59
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Solution
The correct option is
D
62
Formula unit mass (u) of
N
a
2
O
= 2 x atomic mass of sodium + atomic mass of oxygen
=
2
×
23
+
16
=
62
u
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6
Similar questions
Q.
Calculate the formula unit masses of
Z
n
O
,
N
a
2
O
,
K
2
C
O
3
.
(atomic masses of
Z
n
=
65
u
,
N
a
=
23
u
,
K
=
39
u
,
C
=
12
u
and
O
=
16
u
)
Q.
Question 2
Calculate the formula unit masses of
Z
n
O
,
N
a
2
O
,
K
2
C
O
3
. Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.
Q.
Calculate the formula masses of the following compounds :
(i) Sodium oxide, Na
2
O
(ii) Aluminium oxide, Al
2
O
3
(Given : Atomic masses : Na = 23 u ; O = 16 u ; Al = 27 u)
Q.
Calculate the formula unit mass (u) of
N
a
C
l
:
[
N
a
=
23
u
,
C
l
=
35.5
u
]
Q.
(a) Define 'formula unit' of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride ?
(b) Calculate he formula masses of the following compounds :
(i) Calcium chloride
(ii) Sodium carbonate
(Given : Atomic masses : Ca = 40 u ; Cl = 35.5 u ; Na = 23 u ; C = 12 u ; O = 16 u)
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