Which event is the first (oldest) event and which event occurred last (most recent)? G is the oldest, and E is the youngest
E is the oldest, and A is the youngest
A is the oldest, and E is the youngest
H is the oldest, and G is the youngest

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.

it would be a gas formation

the answer is 75.0%.