Over sushi and sake at dinner one day, your friend Hong (an expert chemist) says this:

Question

"Metal sulfides roasted with oxygen produce the corresponding oxide and sulfur dioxide gas."
Using Hong's statement, and what you already know about chemistry, predict the products of the following reaction.

Be sure your chemical equation is balanced!
ZnS(s) + O2(g)

Answer 1

The statement from Hong implies that when ZnS (a metal sulfide) is roasted with oxygen (O2), it will produce the corresponding oxide (ZnO) and sulfur dioxide gas (SO2).

The balanced chemical equation for this reaction is:
2 ZnS(s) + 3 O2(g) → 2 ZnO(s) + 2 SO2(g)