what mass of zinc will be required to react completely with 100cm3 of a 1.0M hcl.

Answer 1

Zn + 2HCl ==> H2 + ZnCl2

mols HCl used = M x L = ?
Using the coefficients in the balanced equation, convert mols HCl to mols Zn.
Then mols Zn = grams Zn/atomic mass Zn. You know atomic mass and mols Zn, solve for grams Zn.

Answer 2

Zn + 2 HCl ---> ZnCl₂ + H₂

so .1 moles of HCl reacts with .05 moles of Zn

molar mass of Zn is 65.38 g

.05 * 65.38 = ?