Iron and HCl react to form iron(II) chloride and hydrogen gas. What mass of iron (II) chloride could be produced from 35.0 g of Fe and excess HCl?

Answer 1

Write the correctly balanced equation for the reaction:

Fe(s) + 2HCl(aq) ==> FeCl₂(aq) + H₂(g) ... balanced equation

atomic mass Fe = 55.85 g/mol

molar mass FeCl₂ = 136.8 g/mol

35.0 g Fe x 1 mol Fe / 55.85 g Fe x 1 mol FeCl₂ / mol Fe x 126.8 g FeCl₂/ mol = 79.5 g FeCl₂ (3 sig. figs.)