50 g of ice at 0 and degC is dropped in a beaker containing 100 g of water at 0 and degC. What will be the contents of the beaker after 5 hours Assume that the room temperature is 0 and degC.?

After 5 hours, the contents of the beaker will remain at 0 °C. The 50 g of ice will not melt since the surrounding water is also at 0 °C, and there is no heat transfer from the environment to raise the temperature. Thus, the beaker will contain both 50 g of ice and 100 g of water, all at the same temperature of 0 °C.