Question

What mass of hydrogen gas is displaced when 6.0 mol of iron react with excess
hydrochloric acid according to the process outlined below.
2 Fe + 6 HCl → 2 FeCl3 + 3 H2
(A) 9.0g H2
(B) 6.0g H2
(C) 12.0g H2
(D) 18.0g H2

Answer 1

18 g of hydrogen gas

Explanation:

We have the following chemical reaction:

2 Fe + 6 HCl → 2 FeCl₃ + 3 H₂

Knowing the stoichiometry of the chemical reaction, we devise the following reasoning:

if        2 moles of iron react produces 3 moles of hydrogen

then   6 moles of iron react produces X moles of hydrogen

X = (6 × 3) / 2 = 9 moles of hydrogen

mass = number of moles × molecular weight

mass of hydrogen (H₂) = 9 × 2 = 18 g

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