A chemist adds 6.5 L of concentrated (12 M) hydrochloric-acid solution to 15 L of water. What is the new solution’s concentration? M1V1 = M2V2

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.