. In the flask in which the balloon was inflated fully – assume here that the flask was filled with HCl to the top) – estimate the final volume of the balloon. You may assume that the pressure was equal to 1 Atm.

Explanation:

I assume that you have 7 g of Zn, excess HCl, and a temperature of 25 °C.

We will need a balanced chemical equation with molar masses, so, let's gather all the information in one place.

Mᵣ:     65.38

            Zn + 2HCl ⟶ ZnCl₂ + H₂

m/g:       7

(a) Moles of Zn

(b) Moles of H₂

The molar ratio is 1 mol H₂:1 mol Fe

(c) Volume of H₂

We can use the Ideal Gas Law to calculate the volume of hydrogen.

pV = nRT