Question

What mass of zinc is required to produce hydrogen by reaction with HCl which is enough to produce 4 mol of ammonia according to the reactions?

Zn + 2HCl → ZnCl₂ + H₂ 

3H₂ + N₂ → 2NH₃

Answer 1

The given equations are 

Zn + 2HCl → ZnCl₂ + H₂ 

3H₂ + N₂ → 2NH₃ 

From the equations it is clear that 

2 mol of NH₃ require = 3 mol of H₂ ; 

3 mol of H₂ require = 3 mol of Zn Thus, 2 mol of NH₃ require = 3 mol of Zn = 3 × 65 g of Zn

∴ 4 mol of NH₃ require