The force of friction is directed opposite of the way an object is moving because ? a. friction lifts an object off of a surface. b. friction restricts motion. c. friction is a negative force that repels objects like two magnets. d. the object would slow down too much without friction

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.

the answer is 75.0%.