What is true at stp? a. temperature is 273.15 kelvin. b. one mole of gas occupies one liter of volume. c. pressure is 101 atmosphere. d. volume is 4.2 liters.

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.