Question

You are the supervisor for the production of H 2 S gas in a chemical plant. Your team can use two

possible processes at STP to produce 20 liters of the gas. Your aim is to cut expenses when procuring

reactants. Which of the two processes will your team use and why?

1) FeS(s) + HCl(aq) = FeCl 2 (aq) + H 2 S(g)

2) H 2 O(l) + Al 2 S 3 (s) = H 2 S(g) + Al(OH) 3 (s)

Answer 1

It will be preferable for my team to use process 2.

The reason is that water, which is easily available at low cost is a reactant in the second process.