Question

34 atoms of carbon react with 22 molecules of hydrogen gas. How many molecules of methane will be formed & what will be left over?

Answer 1

11 molecules of methane would be correct

Answer 2

Answer: 11 molecules of methane and carbon will be left over.

Step-by-step explanation:
`C+2H_2\rightarrow CH_4`

According to given balanced equation,

1 atom of carbon reacts with 2 molecules of hydrogen to form 1 molecule of methane.

Thus 32 atoms of carbon will react with=
`(2)/(1)* 32=64` molecules of hydrogen.

But only 22 molecules of hydrogen are available.

Thus we see it the other way.

2 molecules of hydrogen react with 1 atom of carbon

22 molecules of hydrogen will react with=
`(1)/(2)* 22=11`

atoms of carbon

Thus hydrogen is the limiting reagent as it limits the formation of product. Carbon is excess reagent and (34-11)=23 atoms of carbon will be left over.

2 molecules of hydrogen form 1 molecule of methane.

22 molecules of hydrogen form=
`(1)/(2)* 22= 11` molecules of methane.