How do i know what and how much of the elements are in these compounds?

Question

i need to write their grams but i need to know the specific elements in these:copper(ii) sulfate pentahydrate

mercuric oxide

sulfur trioxide

how do i find what they have as in the elements they carry?
like hydrochloric acid has HCL.... that one sounds like the 2 elements but the ones on the top i don't know.

Answer 1

This is chemistry, but like baseball, you can't tell the players without a scorecard. As for the weird terms, you'll pick them up as you go along. For instance Copper(II) sulfate pentahydrate. Copper is an element. When it reacts, it can react with a +1 or +2 valance. In this case, it is +2. Sulfate is SO4=. Since it has a -2 charge, one of these joins with a Cu+2. Pentahydrate means 5 water molecules. Without getting too much into bonds, copper can forms distinct compounds with water. Because the water has is neutral, we call such compounds complexes.

Mercuric oxide- Like copper, Hg can form +1 or +2 ions. The +2 ion is sometimes referred to as the "ic" form as opposed to the "ous" form for the +1 ion. Oxide is oxygen, and since oxygen almost always has a -2 valence, the compound is HgO.

Sulfur trioxide- Sulfur forms two different compounds with oxygen, SO2 and SO3. This is the second of these.

Answer 2

copper sulfate pentahydrate - copper, sulfure, oxygen (and oxygen and water in the "pentahydrate" part)
Mecuric oxide - mercury and oxygen
sulfur trioxide - sulfur and oxygen