If the student did another experiment by mixing 1.33 grams of barium chloride and 1.33 grams of Na2SO4 in deionized water. Determine how many grams of excess reactant left over after the reaction. Keep two decimal places.

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products