What is the name of the compound K3N

Potassium nitride is an unstable chemical compound. It is made by the mixture of two elements i.e. Potassium and Nitride. It is a slightly yellow crystalline solid. It's Molar mass is 131.3016g/mol.

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.