From the stoichiometry of the reaction and the data provided, the mass of zinc reacted is 16.25 g.
Reaction equation:
The term reaction equation shows the conversion of reactants into products. Now the reaction equation here is; Zn(s) + 2HCl(aq) ---->ZnCl2(aq) + H2(g).
Number of moles of HCl = 0.25 M * 2 L = 0.5 moles
If 2 moles of HCl reacts with 1 moles of Zn
0.5 moles of HCl will react with 0.5 moles * 1 mole/2 moles
= 0.25 moles
Mass of Zn = 0.25 moles * 65 g/mol = 16.25 g
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