solution stoichometry

Question

25.0 g of zinc are reacted with 1855 mls of 0.250 M hydrochloric acid. How many grams of hydrogen gas are produced?

Answer 1

This is a limiting reactant problem. We need the reaction:

Zn + 2HCl ⇒ ZnCl₂ + H₂

One of the easiest ways is the brute force of calculating g of hydrogen produced by each reactant if the other is in excess. Whichever value of grams of Hydrogen is less is the answer and you also know the limiting reactant.

25.0 g Zn(1 mole/65.38 g Zn)(1 mole H₂/ 1 mole Zn)(2.016 g/mole H₂) =

1855 ml(1 liter/1000 ml)(.25 mole HCl/liter)(1 H₂/2 HCl)(2.016 g/mole H₂) =

I'll leave the calculation to you.

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