1. How many molecules are in 0.500 mole of N2O5?
A. 1.20 X 1023 molecules
B. 3.01 X 1023 molecules
C. 6.02 X 1023 molecules
D. 3.01 X 1024 molecules

Select all that apply. when the products of a reaction have less energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants lost internal energy. the change in enthalpy is positive.