In an exothermic reaction, the enthalpy change is negative. which of the following is also true for an exothermic reaction?

the products have a lower potential energy than the reactants.

the reactants have a lower potential energy than the products.

the potential energy of both the reactants and products is the same.

the potential energy decreases, and then increases sharply at the end of the reaction.

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.