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Byju's Answer
Standard XII
Chemistry
Molecular Speeds - Vrms, Vavg, Vmps
wht is the no...
Question
wht is the no of molecules present in (i) 15 l of h2 gas at stp
(ii) 0.5 g of h2 gas
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Solution
Dear Student,
1
.
22
.
4
L
of
H
2
=
1
mole
15
L
=
1
22
.
4
×
15
=
0
.
6696
mole
2
)
number
of
moles
=
Given
Mass
molar
mass
=
0
.
5
2
=
0
.
25
mole
Number
of
molecules in 1 mole = 6.023 ×10
23
molecules
Number
of
molecules in 0.25 mole =0.25 ×6.023 ×10
23
molecules = 1.505
×
10
23
molecules
Regards
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