Hydrogen has been suggested as the fuel of the future. One way to store it is to convert...

Hydrogen has been suggested as the fuel of the future. One way to store it is to convert it to a compound that can be heated to release the hydrogen. One such compound is calcium hydride, This compound has a heat of formation of –186.2 kJ/mol and a standard entropy of 42.0 J/mol · K. What is the minimum temperature to which calcium hydride would have to be heated to produce hydrogen at one atmosphere pressure?