Question

http://i.imgur.com/UB7Zdw7.png

How would I solve for the mass of the compound and mass of C? I also dont see how H=2.02 when in the formula there are 20 atoms of H.

Thanks

Answer 1

Atomic mass of carbon x 9

Answer 2

That doesn't work

Answer 3

Yes it does.

Answer 4

Atomic mass of H x 2=2.02g

Answer 5

It says its wrong.

Answer 6

What did you put for the mass of C then?

Answer 7

9*12.011=108.099

Answer 8

And your compound?

Answer 9

Compound mass?

Answer 10

108.099+2.02=110.12

Answer 11

You forgot to to add the atomic mass of oxygen
There is only 1 oxygen in the compound.

Answer 12

Thats a 0 is H subscript 20

Answer 13

Are you the one that put H=2.02 g and got it right?
Or is it automatically put in like that?

Answer 14

Or it can be wrong?

Answer 15

Its automatically 2.02

Answer 16

If you put H=2.02g then erase it and
multiply the atomic mass of H x 20

Answer 17

you can't change anything thats automatically there

Answer 18

atomic mass of H x 20=20.16/2.02=10
atomic mass of C x 9=108.09/10=10.80

Answer 19

Try it now.