A sample of (C2H6) ethane has the same mass as 10^7 molecules of methane. How many C2H6 molecules does the sample contain?
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Mass of 1 molecule of CH
4
=
N
A
16
g
Mass of 1.5×10
20
molecules of methane =
N
A
1.5×10
20
×16
g
Mass of x molecules of C
2
H
6
is =
N
A
1.5×10
20
×16
g
We know that mass of 1 molecule of C
2
H
6
=
N
A
30
g
∴ Number of molecules of ethane (x) =
N
A
1.5×10
20
×16
×
30
N
A
=0.8×10
20
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