How many moles of H2 can be produced from 2 moles and of Al and 2 moles of HCl

Answer 1

Hello, Poop,

Predict the products and balance the chemical equation. HCl reacts with Al to form AlCl₃ and H₂. Start with 1 AlCl₃ and determine what quantity of reactants are needed to produce it and H₂ such that the equation is balanced. 1 AlCl₃ would require 3 HCl. But we need hydrogen as H₂, since it is diatomic. That means we need an even number of HCl molecules to work, so double the AlCl₃ to 2, and work from there. That seems to work:

We are given 2 moles each of Al and HCl, but the equation says we need 6/2 or 3 times the amount of HCl as Al to react completely. So the HCl is the limiting reagent.

The molar ratio of H₂ to HCl is 1/2. Assuming all two moles of HCl react, we would get 2(1/2) = 1 mole of H₂.

Bob