1) 75 g of water at 10 °C is heated by supplying 25200 J of heat energy. Calculate the final temperature of water. [Specific heat capacity of water = 4200
2) A solid of specific heat capacity 2.1 J/kg °C at 100 °C is dropped into 400 g of water at 25 °C. If the final temperature is 40 °C, find the mass of the solid.