Hydrobromic acid dissolves solid iron to form aqueous iron(II) bromide and hydrogen gas. What mass of hydrogen gas (in grams) will be produced upon dissolving a 4.60 g iron bar on a padlock to get it open?

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