Overview
A piece of solid antimony weighing 41.6 g at a temperature of 617 °C is placed in 416 g of liquid antimony at a temperature of 750 °C. After a while, the solid melts and a completely liquid sample remains. Calculate the temperature after thermal equilibrium is reached, assuming no heat loss to the surroundings. The enthalpy of fusion of solid antimony is ΔHfus = 19.6 kJ/mol at its melting point of 631 °C, and the molar heat capacities for solid and liquid antimony are Csolid = 25.4 J/mol K and Cliquid = 31.5 J/mol K.
Tfinal = °C