What is the compound name for S4O5

Answer: Tetrasulfur pentoxide

Explanation: S is sulfur on the periodic table and O is oxygen on the periodic table. We use those two elements as our root words.

Since both elements are non-metals we name them using prefixes. The prefix for 4 is tetra - and the prefix for 5 is penta-.

So now we have Tetra sulfur pentoxygen, the last step is to - ide the second element which is where we get the answer Tetrasulfur pentoxide.

Tetrasulfur pentoxide