The chemical formula for tin (IV) sulfide is SnS₂. Here's how to determine that:

* Tin (IV) means the tin ion has a +4 charge (Sn⁴⁺).

* Sulfide refers to the sulfur ion, which has a -2 charge (S²⁻).

To create a neutral compound, you need two sulfide ions (2 x -2 = -4) to balance the +4 charge of the tin ion.