Find the unknown metal

Question

A certain metal (M) reacts with HCl according to the equation;

M (s) + HCl (aq) → MCl2 (aq) + H2 (g)

1.44 g of the metal reacts with 225 mL of 0.196 mol/L HCl. What is the metal?

Answer 1

M (s) + 2HCl (aq) → MCl₂ (aq) + H₂ (g)

1 mol M reacts with 2 mol HCl to produce 1 mol MCl₂

mole HCl used = 225 ml x 1 L/1000 ml x 0.196 mol/L = 0.0441 mol HCl

mol M reacted = 0.0441 mol HCl x 1 mol M/2 mol HCl = 0.0221 mol M

atomic mass of M = 1.44 g/0.0221 mol = 65.1 g/mol

M = Zinc (Zn)