Calculate the energy required to exxite the hydrogen electron from level n= 1 to level n =2 . Also calculate the wavelength to light that must be absorbed by a hydrogen atom in its ground state to reach this excited state

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.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest