An 80 g piece of gold at 650 K is dropped into 100 g of H2O (l) at 298 K in an insulated container at 1 bar pressure. Calculate the temperature of the system once equilibrium has been reached. Assume that CP,m for Au and H2O are constant at their values for 298 K throughout the temperature range of interest. CP,m (Au) =25.4 J/(mol K); CP,m (H2O) =33.6 J/(mol K).