Hot water has a higher ph value than cold water holds less dissolved oxygen than cold water is beneficial to living organisms in aquatic ecosystems contains more hydrogen than cold water

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.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.