Question

2Fe + 6HCl -> 2FeCl3 + 3H2 If 7.0 moles of HCl is added to enough iron that the HCl is completely used up, how many

moles of hydrogen gas will be produced?

Answer 1

Answer: 3.5 moles of hydrogen gas will be produced.

Step-by-step explanation:

The balanced chemical equation is:

`2Fe+6HCl\rightarrow 2FeCl_3+3H_2`

As HCl gets completely used up,
`HCl` is the limiting reagent.

According to stoichiometry :

6 moles of
`HCl` produces = 3 moles of
`H_2`

Thus 7.0 moles of
`HCl` produces=
`(3)/(6)* 7.0=3.5moles` of
`H_2`

Thus 3.5 moles of hydrogen gas will be produced.