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Standard IX
Chemistry
Question
Formula unit mass for
K
2
C
O
3
is :
140u
138u
120u
125u
A
120u
B
125u
C
140u
D
138u
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Solution
Verified by Toppr
The correct option is
B
138u
Formula unit mass of
K
2
C
O
3
=
2
×
A
t
o
m
i
c
m
a
s
s
o
f
K
+
1
×
A
t
o
m
i
c
m
a
s
s
o
f
C
+
3
×
A
t
o
m
i
c
m
a
s
s
o
f
O
=
2
×
39
u
+
1
×
12
u
+
3
×
16
u
= 138 u.
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