Question

how many mililiters of a 0.27 M HCl solution are needed to react completely with 2.7 g of zinc to form zinc (II) chloride?"

equation.
2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2

Answer 1

1. Convert 2.7 g Zn to moles. moles = grams/molar mass.
2. Using the coefficients in the balanced equation, convert moles Zn to moles HCl.
3. Now convert moles HCl to volume.
M = moles/L. You know M and moles, calculate L, then convert to mL.