In the reaction below, if a total of 10.0 g of zinc and hydrochloric acid react completely, what is the total mass of zinc chloride and hydrogen produced? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Question

help! this is really confusing

Answer 1

What's confusing?

Look at the balanced equation and use the mol ratios to determine the mols of product (zinc chloride) and hydrogen (H₂) produced. Then use the molar mass of zinc chloride to convert mols to grams.

Zn(s) + 2HCl(aq) ==> ZnCl₂(aq) + H2(g) ... balanced equation

10.0 g Zn x 1 mol Zn / 65.4 g = 0.152 mols of Zn

0.152 mols Zn x 1 mol ZnCl₂ / 1 mol Zn = 0.152 mols ZnCl₂ produced

Converting to grams...

0.152 mols ZnCl₂ x 136 g / mol = 20.7 g ZnCl₂ produced

0.152 mols Zn x 1 mol H₂ / mol Zn = 0.152 mols H₂

Converting to grams...

0.152 mols H₂ x 2 g / mol = 0.304 g H₂ produced