Magnesium–aluminum alloys are widely used in aircraft construction. One particular alloy contains 70.0% Al and 30.0% Mg, by mass. How many grams of H₂(g) are produced in the reaction of a 0.710 g sample of this alloy with excess HCl(aq)? Balanced chemical equations are given below for the reactions that occur.

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2 Al(s) + 6 HCl(aq) Mg(s) + 2 HCl(aq) → 2 AlCl₂(aq) + 3H₂(g) MgCl₂(aq) + H₂(g)