Answer:
(C) 15,000
Explanation:
The equation is ...
CS₂ +3O₂ ⇒ CO₂ +2SO₂
This indicates 1 molecule of CS₂ combines with 3 molecules of O₂ to produce 1 molecule of CO₂ and 2 molecules of SO₂.
Counting molecules, we see that the original 4 molecules in a 1:3 ratio become 1+2 = 3 molecules. The reactants present are in the necessary 1:3 ratio of CS₂ : O₂, so there are no limitations on the reaction. It can use all of the original molecules to produce ...
(3/4)(20,000) = 15,000
molecules of product.
When the reaction completes, there will be 15,000 molecules present.
