Primordial swamps decomposing under ancient seas and tons of rock layers gave rise to an important fuel used today. that fuel is
a) natural gas
b) radon
c) coal
d) oil

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.

2b2t

explanation:

2b2t