Balance the equation first.
mols Zn = grams/molar mass
Using the coefficients in the balanced equation convert mols Zn to mols HCl.
Then M HCl = mols HCl/L HCl. You know M HCl and mols HCl, solve for L HCl and convert to mL.
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation?
? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
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