2. Iron reacts slowly with hydrochloric acid to produce iron (II) chloride and hydrogen gas. Fe + 2HCl  FeCl2 + H2

What mass of hydrogen chloride is required to react with 3.56 g of Iron?

Mass of Hydrogen chloride : 4.672 g

Given

Reaction

Fe + 2HCl ⇒ FeCl2 + H2

3.56 g of Iron

Required

mass of Hydrogen chloride

Solution

mol of Iron (Ar = 56 g/mol) :

mol = mass : Ar

mol = 3.56 : 56

mol = 0.064

mol HCl from the equation :

= 2/1 x mol Fe

= 2/1 x 0.064

= 0.128

Mass HCl :

=mol x MW HCl

= 0.128 x 36.5

= 4.672 g

i'm pretty sure its b i might be wrong though!