1) What mass of water at 30.0°C must be allowed to come to thermal equilibrium with a 2.15-kg cube of aluminum initially at 1.50 × 102°C to lower the temperature of the aluminum to 77.0°C? Assume any water turned to steam subsequently recondenses. kg 2)Lead pellets, each of mass 1.60 g, are heated to 200°C. How many pellets must be added to 460 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect any energy transfer to or from the container. pellets 3)An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 460-g sample of silver at an initial temperature of 89°C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32°C. Calculate the mass of the aluminum cup.