Water at 34.0 °C is sprayed onto 0.154 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is the minimum mass of water that must be used?

A 48.0 g sample of glass, which has a specific heat capacity of 0.670 J.g¯¹.°C¯¹, is dropped into an insulated container containing of water at 15.0 °C and a constant pressure of 1 atm. The initial temperature of the glass is 86.5 °C. 200.0 g Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct number of significant digits. [°C x10 X

To treat a burn on his hand, a person decides to place an ice cube on the burned skin. The mass of the ice cube is 12.5 g, and its initial temperature is -12.2 °C. The water resulting from the melted ice reaches the temperature of his skin, 30.5 °C. How much heat is absorbed by the ice cube and resulting water? Assume that all of the water remains in the hand. Constants for water can be found in this table. q= J

62. A mass m = 0.054 kg of benzene vapor at its boiling point of 80.1 °C is to be condensed by mixing the vapor with water at 41 °C. What is the minimum mass of water required to condense all of the benzene vapor? Assume that the mixing and condensation take place in a perfectly insulating container.