An insulated Thermos contains 200 cm3 of hot coffee at 88 C. You put a 19.0 g ice cube at its melting point to cool the coffee.

An insulated Thermos contains 200 cm3 of hot coffee at 88 °C. You put a 19.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and neglect energy exchanges with the environment.