Question

A sample of ethane (C2H6) gas has the same mass as 1.5 × 1020 molecules of methane (CH4). How many
C2H6 molecules does the sample of gas contain?

Answer 1

Explanation:

A sample of ethane (C2H6) gas has the same mass as 1.5 ×1020 molecules of methane (CH4).

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Answer 2

Answer:

0.8×10

20

Explanation:

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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