The 100mL of water at 100C would have a greater thermal energy (heat) than the 1L of water at 50C. This is because thermal energy is directly proportional to the temperature and the amount of the substance. The higher the temperature of a substance, the greater its thermal energy. In this case, the 100C temperature of the 100mL of water indicates that it has absorbed a greater amount of heat energy than the 50C water in the 1L container. Therefore, even though the volume of the 100mL water is much smaller than the 1L water, its higher temperature gives it more thermal energy.