he formula unit for the ionic compound, stannic sulfide, consists of which of the following?

Question

? 1 Sn2+ ion and 1 S2- ion
? 1 Sn4+ ion and 4 S- ions
? 1 Sn2+ ion and 2 S- ions
? 1 Sn4+ ion and 2 S2- ions
? 1 Sn4- ion and 2 S2+ ions

Answer 1

The correct formula unit for stannic sulfide is based on the charge of the stannic ion, which is Sn^4+, and the charge of the sulfide ion, which is S^2-.

To balance the charges, we can determine the ratio of ions needed:

• The stannic ion (Sn^4+) has a +4 charge.
• The sulfide ion (S^2-) has a -2 charge.

To balance the charges:

• 1 Sn^4+ ion will balance with 2 S^2- ions, since 1(4) + 2(-2) = 0.

Thus, the formula unit for stannic sulfide consists of 1 Sn^4+ ion and 2 S^2- ions.

The correct answer is: 1 Sn4+ ion and 2 S2- ions.