What are the coefficients for the reactants and products in the equation CuCl2 + H2S → CuS + HCl when balanced using the smallest possible integers?

The answer to your question is 1, 1, 1, 2

Explanation:

Reaction

CuCl₂ + H₂S ⇒ CuS + HCl

Reactants Elements Reactants

1 Copper 1

2 Chlorine 1

2 Hydrogen 1

1 Sulfur 1

This reaction is unbalanced

CuCl₂ + H₂S ⇒ CuS + 2HCl

Reactants Elements Reactants

1 Copper 1

2 Chlorine 2

2 Hydrogen 2

1 Sulfur 1

Just add 2 to hydrochloric acid, now the reaction is balanced.