Question

The no. of moles in 80g of CH4 will be 

a.15

b.80

c.16

d.5
​

Answer 1

Answer:

d) 5 moles :)

Explanation:

use the following relationship:

Number of moles

=

Mass

Molar mass

And the molar mass of methane may be read straight off your Periodic Table:

Molar mass of methane,

C

H

4

=

(

12.011

+

4

×

1.00794

)

⋅

g

⋅

m

o

l

−

1

Mass

Molar mass

=

80

⋅

g

16.0

⋅

g

⋅

m

o

l

−

1

=

?

?

m

o

l

.

Note that this calculation is consistent dimensionally:

1

m

o

l

−

1

=

1

1

m

o

l

=

m

o

l

Answer 2

Explanation:

d) option 5

hope it helps