Solid zinc (Zn) reacts with hydrogen chloride to produce zinc(II) chloride and hydrogen gas. If 5.69g of hydrogen gas is released, how many grams of hydrogen was used?

Answer 1

The reaction is Zn(s) + 2HCl ==> ZnCl2 + H2(g) ... balanced equation

Assuming you meant to ask how many grams of hydrogen chloride was used...

Using the stoichiometry of the balanced equation and dimensional analysis, we have the following:

5.69 g H2 x 1 mol H2/2 g 2 mol HCl/mol H2 x 36.5 g HCl/mol = 208 g HCl used