An ice cube with a mass of 20g at -20°C (typical freezer temperature) is dropped into a cup that holds 500 mL of hot water, initially at 83°C. What is the final temperature in the cup? The density of liquid water is 1.00 g/mL; the specific heat capacity of ice is 2.03 J/g-C; the specific heat capacity of liquid water is 4.184 J/g-C; the enthalpy of fusion of water is 6.01 kJ/mol.