Determine the oxidation number of the element "J" in H3JO2-

Oxidation number:

3*1+ oxidation number of J+2*-2= -1

Oxidation number of J = 0

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.