A cube of ice is taken from the freezer at -7.7C and placed in a 98 g aluminum calorimeter filled with 296 g of water at room temperature of 20C.

A cube of ice is taken from the freezer at -7.7°C and placed in a 98 g aluminum calorimeter filled with 296 g of water at room temperature of 20°C. The final situation is observed to be all water at 16°C. What was the mass of the ice cube?