which statement best describes the electrochemical gradient for chloride ions in figure 6.20, assuming the chloride concentrations are equal on both sides of the membrane?

What mass of iron must be in a hot pack to provide -335kj of heat when the iron reacts with oxygen and is converted to iron (111) oxide according to the following thermochemical equation? 2fe(s) + 1.5o2(g)—> fe2o3(s) delta h= -824.2kj/mol