The value of E for a system that performs 120 kJ of work on its surroundings and gains 50 kJ of heat is what?

a police officer and a ambulance

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.