A new element is discovered and needs an atomic mass on its periodic table square. The atomic number is 120, and it has two isotopes. One isotope has 125 neutrons, and it has a percent abundance of 80%. The second isotope has 130 neutrons. What is the atomic mass that should go on the periodic table? (Enter the answer as a whole number 000)

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.