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Standard X
Chemistry
Average and Relative Atomic Mass
The percentag...
Question
The percentage of oxygen in
C
H
2
O
is:
A
40
%
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B
6.6
%
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C
53.33
%
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D
49
%
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Solution
The correct option is
C
53.33
%
The atomic weights of
C
,
H
and
O
are 12 g/mol, 1 g/mol and 16 g/mol respectively.
The molecular weight of
C
H
2
O
is
12
+
2
(
1
)
+
16
=
30
g/mol.
The percentage of oxygen in
C
H
2
O
is
16
30
×
100
=
53.33
%.
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