Select all the exothermic reactions from the list below. Group of answer choices

C + O2 --> CO2 + 167 kJ

KClO3 + heat --> KCl + O2

2Al + Fe2O3 --> Al2O3 + 2Fe + heat

2Zn(NO3)2 + heat --> 2ZnO + 2NO2 + 3O2

2H2O2 --> 2H2O + O2 + 148 kJ

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.

answer; natural resources;

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