Ar. tank contains h. initially at 100 kn/m2 and 20°c. 1 1/2 kg of h added so that t2 and p of the tank is 30°c and 250 kpa, det. the volume of the tank(m3) and the final mass of the hydrogen inside the tank (kg)

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.