How many grams of hydrogen gas are produced in the reaction of 60 grams of HCl with excess zinc?

Answer 1

The chemical formula for this reaction would be Zn + 2HCl ---> ZnCl₂ + H₂.

The molecular mass of of HCl is about 36 g/mol, so dividing the 60 g of HCl by its molecular mass tells us that we have 1.67 moles of HCl. We can use the coefficients in the reaction as a molar ratio of HCl:H₂, and we find a 2:1 ratio, which means that we make 0.83 moles of H₂. The molecular mass of H₂ is about 2 g/mol, so multiplying that by our 0.83 moles of H₂ gives you 1.67 grams of H₂.

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