The limiting reactant would be magnesium. The gram of hydrogen gas that will be produced would be 0.24 g.
Limiting Reactants
They are reactants that determine the yield of a reaction.
From the equation of the reaction:
2HCl + Mg ---> MgCl2 + H2
The mole ratio of HCl to Mg is 2:1
Mole of HCl = 4/36.5
= 0.11 mole
Mole of Mg = 3/24.3
= 0.12
Equivalent mole of Mg = 0.11 x 2
= 0.22
Thus, Mg is the limiting reactant.
Mole ratio of Mg and H2 = 1:1
Mass of 0.12 mole H2 = 0.12 x 2
= 0.24 g
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