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Standard XII
Physics
Question
How many molecules of
C
O
2
are present in one litre of air containing
0.03
%
by volume of
C
O
2
at STP?
8.066
×
10
−
10
8.066
×
10
−
18
8.066
×
10
18
8.066
×
10
10
A
8.066
×
10
−
18
B
8.066
×
10
−
10
C
8.066
×
10
10
D
8.066
×
10
18
Open in App
Solution
Verified by Toppr
At STP,
22.4
liters of a gas forms one mole that is
6.023
×
10
23
molecules.
Volume of
C
O
2
in
1
litre of air
=
0.03
100
×
1
L
∴
No. of molecules of
C
O
2
=
6.023
×
10
23
22.4
×
0.03
100
=
8.066
×
10
18
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8
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