The molar heats of fusion and vaporization for silver are 11.3 kJ/mol and 250 kJ/mol, respectively. Silver's normal melting point is 962°C, and its normal boiling point is 2212°C. What quantity of heat is required to melt 17.8 g of silver at 962°C? What quantity of heat is liberated when 4.71 g of silver vapor condenses at 2212°C?