What is the mass of H2 that can be produced from 35.7g of HCl

Answer 1

We have been given 35.7 g of HCl and we are looking for the mass of H₂ produced by this amount of HCl. Thus, let's use the molar mass of H₂ to help us find H₂'s mass.

35.7 g HCl × 1mol HCl / 36.458g/mol = 0.9792 mol HCl.

Note that the molar mass of Hydrogen is 1.008, but since it's a Dihydrogen molecule, the molar mass will be 2×1.008= 2.016 g/mol. Therefore,

0.9792 mol HCl × 2.016 g H₂/1 mol H₂ = 1.974 g H₂

Thus, the mass of H₂ produced by from 35.7 g HCl is 1.974 g.