There is water in one vessel, ice in the other. The masses of water and ice are the same.

There is water in one vessel, ice in the other. The masses of water and ice are the same. There is a large supply in the first or second vessel energy? Why?

The energy reserve of any system is determined by its internal state and consists mainly of the kinetic energy of moving particles and the energy of their interaction. And since with an increase in temperature, the speed of movement of molecules increased, then a vessel with water, which has a higher temperature than a vessel with ice, also has a greater supply of kinetic energy of molecular motion, and therefore a greater supply of energy for the entire system.