The density of liquid oxygen at its boiling point is 1.14 kg/l , and its heat of vaporization is 213 kj/kg . how much energy in joules would be absorbed by 2.0 l of liquid oxygen as it vaporized?

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.