In the following food chain, plants provide 500J of energy to rats. How much energy will be available to hawks from snakes?

The energy transfer in a food chain states that only 10 percent of energy is transferred from one trophic level to the next and the remaining is lost by the metabolic process. So, 500 J from plants to rats and then 50 J to snakes (500 J * 0.1 = 50 J) and 5 J to the hawks (50 J * 0.1 = 5 J). Thus, the hawks will have 5 J of energy.