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Write the symbol for every chemical element that has atomic number less than 14 and atomic mass greater than 23.2 u.

that symbol less than atomic number 14 and greater than mass number 23.2 is mg

well in order to answer this question you have to provide more information < 3

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.