What is the chemical formula for ammonium sulfide

The chemical formula for ammonium sulfide is (NH4)2S

The chemical formaula for ammonium sulfide would be ammonium (NH₄⁺) plus sulfur (S⁺²). So now what we would do is figure out how to balance the charges (to create a stable molecule) using our knowledge of valence electrons. Or we can use a shortcut and switch the subscripts of the two atoms so it looks like this: (NH₄)₂S.

(We used a shortcut, but essentially what we did was figure out how many of each atom/ion we would need to create a balanced molecule.)

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.