Question

what is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?

Answer 1

You would get 10.01 grams.

Answer 2

Theoretical yield of H2 = 10.0 g

Step-by-step explanation:

Given:

Moles of Zn added = 5.00

To determine:

The theoretical yield of H2 gas

Calculation:

The balanced reaction between Zn and HCl is as shown below:

`Zn + 2HCl \rightarrow ZnCl2 + H2`

Based on the reaction stoichiometry:

Since HCl is in excess, the limiting reagent is Zn. Thus,

1 mole of Zn will produce 1 mole of H2

Accordingly, 5 moles of Zn will produce 5 moles of H2

Molar mass of H2 = 2 g/mol

Mass of H2 produced =
`Moles * Molar\ mass = 5.00 mol*2 g/mol = 10.0 g`